Dart file :

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:webview_flutter/webview_flutter.dart';
// import 'package:audioplayers/audioplayers.dart';
import 'package:audioplayers/audio_cache.dart';

class JeuLettresImage extends StatefulWidget {
  const JeuLettresImage({Key key, this.categorie, this.lettre});

  final String categorie;
  final String lettre;

  @override
  _JeuLettresImageState createState() => _JeuLettresImageState();
}

class _JeuLettresImageState extends State<JeuLettresImage> {
  WebViewController _controller;
  static AudioCache player = AudioCache();

  @override
  Widget build(BuildContext context) {
    

    return Scaffold(
      resizeToAvoidBottomPadding: false,
      floatingActionButton: Container(
        margin:EdgeInsets.only(top:MediaQuery.of(context).size.width / 100 * 0.42),
        height:MediaQuery.of(context).size.width / 100 * 5.8,
        width:MediaQuery.of(context).size.width / 100 * 5.8,
        // color:Colors.limeAccent,
        child: GestureDetector(
          child:Image.asset('assets/img/sousMenus/backButton.png'),
          onTap: () {
            Navigator.pop(context);
          }
        )
      ),
      // floatingActionButtonLocation: FloatingActionButtonLocation.endTop,
      body: Container(
        
        child: WebView(

          initialUrl: 'about:blank',
          javascriptMode: JavascriptMode.unrestricted,
          
          onWebViewCreated: (WebViewController webViewController) {
            _controller = webViewController;
            _loadHtmlFromAssets();
          },
          javascriptChannels: Set.from(
            [
            
              JavascriptChannel(
                name: 'gameEngineStart',
                onMessageReceived: (JavascriptMessage message) {
                  var javascript2 = '''
                    initialisation("''' + widget.lettre + '''", true);
                  ''';
                  _controller?.evaluateJavascript(javascript2);
                }
              ),
              
            ],
          ),

        ),
      )
    );
  }


  _loadHtmlFromAssets() async {
    String fileText;
    if(widget.categorie == 'avecImage'){
      fileText = await rootBundle.loadString('assets/HTML/jeuLettres/lettreAvecImage.html');
    }
    
    _controller.loadUrl( Uri.dataFromString(
        fileText,
        mimeType: 'text/html',
        encoding: Encoding.getByName('utf-8')
    ).toString());
  }

}

In the HTML i have SVG inline.
In my javascript i make scale (or scale 3D) translate (or translate3d) for anime the SVG inline inside the HTML.

Index.html

<!DOCTYPE html>

<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>
    <meta name="description" content="">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    

    <!-- NORMALIZE -->
    <style>/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */html{line-height:1.15;-webkit-text-size-adjust:100%}body{margin:0}main{display:block}h1{font-size:2em;margin:.67em 0}hr{box-sizing:content-box;height:0;overflow:visible}pre{font-family:monospace,monospace;font-size:1em}a{background-color:transparent}abbr[title]{border-bottom:none;text-decoration:underline;text-decoration:underline dotted}b,strong{font-weight:bolder}code,kbd,samp{font-family:monospace,monospace;font-size:1em}small{font-size:80%}sub,sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}img{border-style:none}button,input,optgroup,select,textarea{font-family:inherit;font-size:100%;line-height:1.15;margin:0}button,input{overflow:visible}button,select{text-transform:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{border-style:none;padding:0}[type=button]:-moz-focusring,[type=reset]:-moz-focusring,[type=submit]:-moz-focusring,button:-moz-focusring{outline:1px dotted ButtonText}fieldset{padding:.35em .75em .625em}legend{box-sizing:border-box;color:inherit;display:table;max-width:100%;padding:0;white-space:normal}progress{vertical-align:baseline}textarea{overflow:auto}[type=checkbox],[type=radio]{box-sizing:border-box;padding:0}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{-webkit-appearance:textfield;outline-offset:-2px}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}details{display:block}summary{display:list-item}template{display:none}[hidden]{display:none}</style>

    <link rel="stylesheet" href="css.css?t=3">

  </head>


  <body scroll="no">
    

    <div id="gameContainer">


			<!-- GAME ENGINE -->
			<div id="gameCanvas">


        <div id="Block-A">

          <svg id="SVG_A_Fond" class="SVG SVG_A" style="display:none" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 3298 3490">
            <g id="Fond-A">
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            </g>
          </svg>

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                <path class="cls-25" d="M1723.18 1909.36l-4.82-6a8.6 8.6 0 01-1.88-5.37v-5.16a6.27 6.27 0 00-2.86-5 5.93 5.93 0 01-1.5-1.58.36.36 0 01-.06-.2 4.57 4.57 0 014.57-4.46 4.68 4.68 0 014.69 4.57m0 3.54v-20.33a3.93 3.93 0 013.92-3.91 3.94 3.94 0 013.92 3.94v14.13a3.87 3.87 0 011.23-.2 3.93 3.93 0 005.12 1.69 3.9 3.9 0 013.58 2.34 4 4 0 011.54-.32 3.92 3.92 0 013.91 3.91v8.94a8.59 8.59 0 01-1.11 4.23"/>
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              </g>
              <g id="boutonSon-A" style="opacity: 0; transform-box: fill-box;">
                <circle cx="1885.5" cy="1815.48" r="56.67" fill="#7fc575"/>
                <path class="cls-16" d="M1885.5 1765.63a49.85 49.85 0 11-49.84 49.85 49.9 49.9 0 0149.84-49.85m0-13.65a63.5 63.5 0 1063.5 63.5 63.5 63.5 0 00-63.5-63.5z"/>
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              </g>
            </g>
          </svg>
          
        </div>




			</div>


      <div id="gameNavigationBack">

      </div>






      <div id="gameNavigationNext">

			</div>
			

    </div>



    <div id="victoryScreen">
      <div id="victoryScreenBackground">

      </div>

      <div id="victoryScreenContent">
        
        <div id="victoryScreenSVG">

          <svg id="victoryScreenSVGMains" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 3852 3852">
            <style>
              .st2{fill:none;stroke:#ffffff;stroke-width:60;stroke-linecap:round;stroke-miterlimit:10}
            </style>
            <g id="mains">
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              <g id="victoryScreenMainEffets2" style="opacity:0;">
                <path class="st2" d="M2444 1178l-5 79M2630 1390l-79-5M2576 1247l-59 52"/>
              </g>
            </g>
          </svg>


          <svg id="victoryScreenSVGFormes" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 3852 3852">
            <style>
              .st15{fill:none;stroke:#ffffff;stroke-width:10;stroke-linecap:round;stroke-miterlimit:10}
            </style>
            <g id="victoryScreenSVGFormes-Formes" style="opacity:0;">

              <linearGradient id="_x35__2_" gradientUnits="userSpaceOnUse" x1="219.9" y1="2546.7" x2="244.8" y2="2659.1">
                <stop offset="0" stop-color="#EAE9F2"/>
                <stop offset=".5" stop-color="#D7D4E5"/>
                <stop offset="1" stop-color="#C3BFD8"/>
              </linearGradient>
              <path id="victoryScreenSVGForm-1" class="victoryScreenSVGForms" d="M220 2543l46 52 45 52-66 13-66 14 21-66 20-65z" fill="url(#_x35__2_)" />

              <linearGradient id="_x36__2_" gradientUnits="userSpaceOnUse" x1="464.2" y1="1900.3" x2="464.6" y2="2001.1" gradientTransform="rotate(26 375 2197)">
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                <stop offset="1" stop-color="#F4F2EF"/>
              </linearGradient>
              <circle id="victoryScreenSVGForm-2" class="victoryScreenSVGForms" cx="562.6" cy="2015" r="53.4" fill="url(#_x36__2_)" />
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                <stop offset=".1" stop-color="#B5DEB0"/>
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              </linearGradient>
              <path id="victoryScreenSVGForm-3" class="victoryScreenSVGForms" fill="url(#_x34__2_)" d="M1003 2176l-102 37-37-102 102-37z"/>
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              </linearGradient>
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                <stop offset="0" stop-color="#99E4E4"/>
                <stop offset=".5" stop-color="#7DD5E4"/>
                <stop offset="1" stop-color="#68C9E4"/>
              </linearGradient>
              <path id="victoryScreenSVGForm-5" class="victoryScreenSVGForms" d="M1127 893l32 20 32 21-32 17-33 17 1-37v-38z" fill="url(#_x31_2_2_)"/>
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                <stop offset="1" stop-color="#FEDEA5"/>
              </linearGradient>
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                <stop offset="1" stop-color="#F0AF99"/>
              </linearGradient>
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                <stop offset=".6" stop-color="#6ACAE4"/>
                <stop offset="1" stop-color="#55BFE4"/>
              </linearGradient>
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                <stop offset=".1" stop-color="#B5DEB0"/>
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                <stop offset="1" stop-color="#6ABBB0"/>
              </linearGradient>
              <path id="victoryScreenSVGForm-10" class="victoryScreenSVGForms" fill="url(#_x31__2_)" d="M3083 2788l-46 52-52-46 46-52z"/>
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                <stop offset="0" stop-color="#FFF1A5"/>
                <stop offset="1" stop-color="#FDDEA5"/>
              </linearGradient>
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              </linearGradient>
              <circle id="victoryScreenSVGForm-12" class="victoryScreenSVGForms" cx="3575.6" cy="2790" r="53.4" fill="url(#_x33__2_)"/>
            </g>


            <g id="cheminsforme" style='opacity:0;'>
              <path id="victoryScreenSVGFormPath-1" class="st15" d="M977 4000s142-1459-744-1384"/>
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            </g>

            <g id="victoryScreenSVGFormesAnimation"></g>
          </svg>

        </div>

      </div>

		</div>
		
		

    <div id="screenDeTransition"></div>


    


  </body>
  <script src="js.js"></script>

</html>

css.css

body{
   
    overflow:hidden;
    height:100%;
    width:100%;
}

/* ============= BLOC GAME =============== */

#gameContainer{
	width:100vw;
	height:100vh;
	display: flex;
  flex-direction: row;
  overflow:hidden;
	/* background-color:pink; */
}



#gameNavigationBack{
	width:22vw;
  height:100vh;
  left:0;
	/* background-color:green; */
	overflow: hidden;
	position: absolute;

}

#gameNavigationNext{
	width:22vw;
  height:100vh;
  right:0;
	/* background-color:blue; */
	overflow: hidden;
	position: absolute;
}


/* =================== BLOC GAME ================= */

#gameCanvas{
  width:100vw;
  height:100vh;
  /* background-color:red; */
  overflow:hidden;
  position:absolute;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  transform: 'scale3d(1,1,1)';
  -webkit-backface-visibility: hidden;
  
}

 /* -- SVG COMMUN -- */
 .SVG{
  width: 100%;
  height: 100%;
  left:0%;
  top:0%;
  position:absolute;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  box-sizing: content-box;
  -webkit-backface-visibility: hidden;
}

  .SVG_fondRond{
    transform-origin: center;
  }




/* ============ ECRAN DE VICTOIRE =============== */

#victoryScreen{
  display: none;
}

  #victoryScreenBackground{
    background:#000000;
    position: absolute;
    z-index: 5;
    top:0px;
    left:0px;
    height:100vh;
    width:100vw;
    opacity:0;

  
  }

  #victoryScreenContent{
    position: absolute;
    z-index: 6;
    top:0px;
    left:0px;
    height:100vh;
    width:100vw;
    overflow:hidden;
  }

    #victoryScreenSVG{
      height:100%;
      width:70%;
      margin:auto;
      /* background:orange; */
    }

      #victoryScreenSVGMains{
        height:84vh;
        width:84vh;
        left:50%;
        top:50%;
        -webkit-transform:translate(-50%, -50%);
        transform:translate(-50%, -50%);
        
        position:absolute;
        /* background:green; */
        opacity:0;

      }
      #victoryScreenSVGFormes{
        height:84vh;
        width:84vh;
        left:50%;
        top:50%;
        -webkit-transform:translate(-50%, -50%);
        transform:translate(-50%, -50%);
        position:absolute;
        
        opacity:1;
      }

        #victoryScreenSVGFormesAnimation{
          opacity: 0;
        }



/* ============ ECRAN DE TRANSITION NAVIGATION =============== */
#screenDeTransition{
  display: none;
  position:fixed;
  top:0;
  bottom:0;
  left:0;
  right:0;
  opacity:0;
  z-index:9999;
  background:white;
}

js.js

document.addEventListener('DOMContentLoaded', (event) => {
  // alert(window.innerHeight);
  initialisation('A') // NE PAS OUBLIER D'APPELER LA FONCTION AVEC FLUTTER
  // gameEngineStart.postMessage('rien');
});

let HTMLInitial = document.body.innerHTML;
let alphabetArray = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];

let startLoadTime = 0; // Lancement lent la première fois
let startLoadTimeETAT = false;

//Apple bounce effect FIX
window.addEventListener("touchstart", function(event) {
  event.preventDefault();
}, {passive: false});



//Démmarage
function initialisation(lettre){

  if(startLoadTimeETAT === false){startLoadTime = 250;}
  else{startLoadTime = 0;}
  startLoadTimeETAT = true;

  setTimeout( async () => {
    let popLettreEnd = await popLettre(lettre);
    if(popLettreEnd){
      //Démarrer le Jeu
      startGame(lettre, 1);
    }

  },startLoadTime);
}


  // ============ APPARITION DE LA LETTRE ================
  async function popLettre(lettre){

    const SVG_Lettre = document.querySelectorAll('.SVG_' + lettre);
    const SVG_Lettre_FondRond = document.querySelector('.SVG_fondRond-' + lettre);
    const traces = document.querySelectorAll('.' + lettre + '-cls-1');

    //SVG SELECTOR
    const SVG_Lettre_Bloc = document.querySelector('#gameCanvas');
    const SVG_Lettre_Fond = document.querySelector('#SVG_' + lettre + '_Fond');
    const SVG_Lettre_Illu = document.querySelector('#SVG_' + lettre + '_Illu');
    const SVG_Lettre_IlluGroup = document.querySelector('#Illu-' + lettre);
    const SVG_Lettre_Traces = document.querySelector('#SVG_' + lettre + '_Traces');
    const SVG_Lettre_GestureDetect = document.querySelector('#SVG_' + lettre + '_GestureDetect');


    // -- Génération des Tracés intérieur --
    tracesHelpersModeles = addTracesHelpers(lettre, traces);
    tracesActifs = addTracesActifs(lettre, traces);

    // -- Apparition du Fond et du Dessin --
    for(let i = 0; i < SVG_Lettre.length; i++){
      SVG_Lettre[i].style.display = 'block';
    }
    SVG_Lettre_FondRond.style.transform = 'scale(0.01)';
    SVG_Lettre_FondRond.style.transition = 'all 1s';
    SVG_Lettre_FondRond.style.display = 'block';

    SVG_Lettre_IlluGroup.style.transform = 'scale(0.01)';
    SVG_Lettre_IlluGroup.style.transition = 'all 0.8s';
    SVG_Lettre_IlluGroup.style.display = 'block';

    SVG_Lettre_Bloc.style.transition = 'all 0.8s linear';

    SVG_Lettre_Fond.style.transition = 'all 0.5s linear';
    SVG_Lettre_Illu.style.transition = 'all 0.5s linear';
    SVG_Lettre_Traces.style.transition = 'all 0.5s linear';
    SVG_Lettre_GestureDetect.style.transition = 'all 0.5s linear';
    

    setTimeout(() => {
      requestAnimationFrame(() => {
        SVG_Lettre_FondRond.style.transform = 'scale3d(1,1,1)';
      });

      setTimeout(() => {
        requestAnimationFrame(() => {
          SVG_Lettre_IlluGroup.style.opacity = 1;
          SVG_Lettre_IlluGroup.style.transform = 'scale3d(1,1,1)';
        });
      }, 700);
    }, 200);

    //ZOOM dans l'illu
    let zoomRatio = 1;
    // let zoomTranslate = 0;
    let zoomTranslateAjustementX = 0;
    let zoomTranslateAjustementY = 0;
    let zoomTranslateSymbole = '-';
    if(lettre === 'A'){
      zoomRatio = 8;
      zoomTranslateAjustementY = zoomRatio * 5.1;
      zoomTranslateSymbole = '-';
    }

  
    let attenteSon = 0;
    if(lettre === 'A'){attenteSon = 19000;}
    setTimeout(() => {
      //Lancement du son
      

      if(lettre === 'A'){
      
        SoundLettreStart.postMessage('A');
      }

      setTimeout(() => {
        requestAnimationFrame(() => {
          SVG_Lettre_Fond.style.transform = 'translate(' + zoomTranslateSymbole + zoomTranslateAjustementX + 'vw, ' + zoomTranslateSymbole + zoomTranslateAjustementY + 'vh) scale(' + zoomRatio + ')';
          SVG_Lettre_Illu.style.transform = 'translate(' + zoomTranslateSymbole + zoomTranslateAjustementX + 'vw, ' + zoomTranslateSymbole + zoomTranslateAjustementY + 'vh) scale(' + zoomRatio + ')';
          SVG_Lettre_Traces.style.transform = 'translate(' + zoomTranslateSymbole + zoomTranslateAjustementX + 'vw, ' + zoomTranslateSymbole + zoomTranslateAjustementY + 'vh) scale(' + zoomRatio + ')';
          SVG_Lettre_GestureDetect.style.transform = 'translate(' + zoomTranslateSymbole + zoomTranslateAjustementX + 'vw, ' + zoomTranslateSymbole + zoomTranslateAjustementY + 'vh) scale(' + zoomRatio + ')';
        });
      }, attenteSon);




    }, 1500);

    //Tracé de Démo
    return new Promise(resolve => {
      let traceDemoFin;
      setTimeout(async () => {
        traceDemoFin = await traceDeDemo(lettre, traces);

        if(traceDemoFin){
          startAnimationHelper(lettre, 1);
        
            resolve(true);
        
        }

      }, 2000 + attenteSon);
    });

  }


    // =========== AJOUT DE TRACE DYNAMIQUE ====================
    function addTracesHelpers(lettre, traces){
      let strokeScale;
      if(lettre === 'A'){
        strokeScale = 10;
      }

      for(let i=0; i < traces.length; i++){
        let clone = traces[i].cloneNode(true);
        clone.id = lettre + '_helper_' + (i + 1);
        clone.classList.remove(lettre + '-cls-1');
        clone.classList.add(lettre + '-cls-1-helper');
        clone.style.fill = 'none';
        clone.style.strokeWidth = strokeScale + 'px';
        clone.style.opacity = 1;

        document.querySelector('#' + lettre +'-traces-helpers').appendChild(clone);
      }
      return document.querySelectorAll('.' + lettre + '-cls-1-helper');
    }

      function startAnimationHelper(lettre, numeroLigne){
        let tracesHelpers = document.querySelectorAll('.' + lettre + '-cls-1-helper');


        let scaleHelper = 30;
        let scaleHelperTailleLigne = 500;
        let pointFleche = '0,0 45,50 90,0';
        let pointFlecheTranslate = '15 -45';
        if(lettre === 'A'){
          scaleHelper = 10;
          scaleHelperTailleLigne = 100;
          pointFleche = '0,0 18,20 36,0';
          pointFlecheTranslate = '15 -18';
        }

        //Création de la ligne
        let dashArrayTemp = tracesHelpers[numeroLigne - 1].getTotalLength() - scaleHelperTailleLigne;

        let helpersElement = document.createElementNS("http://www.w3.org/2000/svg", "use");
        helpersElement.setAttributeNS("http://www.w3.org/1999/xlink", 'href', '#' + tracesHelpers[numeroLigne - 1].id);
        helpersElement.setAttributeNS(null, 'stroke-dasharray', scaleHelperTailleLigne + ' ' + dashArrayTemp);
        helpersElement.setAttributeNS(null, 'fill', 'none');
        helpersElement.setAttributeNS(null, 'stroke', '#ffffff');
        helpersElement.setAttributeNS(null, 'stroke-width', '30px');
        helpersElement.setAttributeNS(null, 'stroke-linecap', 'round');
        helpersElement.setAttributeNS(null, 'fill', 'none');
        helpersElement.style.opacity = 0;

        document.querySelector('#' + lettre + '-traces-helpers-animation').appendChild(helpersElement);

        //Création de l'animation ligne
        let helperElementAnimation = document.createElementNS("http://www.w3.org/2000/svg", 'animate');
        helperElementAnimation.setAttributeNS(null, 'attributeName', 'stroke-dashoffset');
        helperElementAnimation.setAttributeNS(null, 'attributeType', 'XML');
        helperElementAnimation.setAttributeNS(null, 'from', scaleHelperTailleLigne);
        helperElementAnimation.setAttributeNS(null, 'to', '-' + dashArrayTemp);
        helperElementAnimation.setAttributeNS(null, 'begin', '0s');
        helperElementAnimation.setAttributeNS(null, 'dur', '1.5s');
        helperElementAnimation.setAttributeNS(null, 'repeatCount', 'indefinite');
        helpersElement.appendChild(helperElementAnimation);

        //Création de la flèche
        let helpersFleche = document.createElementNS("http://www.w3.org/2000/svg", "polyline");
        helpersFleche.id = 'helpersFleche-' + lettre + '-' + numeroLigne;
        helpersFleche.setAttributeNS(null, 'points', pointFleche);
        helpersFleche.setAttributeNS(null, 'transform', 'translate(' + pointFlecheTranslate + ') rotate(90)');
        helpersFleche.setAttributeNS(null, 'stroke-width', scaleHelper + 'px');
        helpersFleche.setAttributeNS(null, 'stroke', '#ffffff');
        helpersFleche.setAttributeNS(null, 'fill', 'none');
        helpersFleche.setAttributeNS(null, 'opacity', 0);

        //Création de l'animation flèche
        let helpersFlecheAnimation = document.createElementNS("http://www.w3.org/2000/svg", "animateMotion");
        helpersFlecheAnimation.setAttributeNS(null, 'dur', '1.5s');
        helpersFlecheAnimation.setAttributeNS(null, 'rotate', 'auto-reverse');
        helpersFlecheAnimation.setAttributeNS(null, 'repeatCount', 'indefinite');
        helpersFlecheAnimation.setAttributeNS(null, 'begin', '0s');
        let helpersFlecheAnimationMPath = document.createElementNS("http://www.w3.org/2000/svg", 'mpath');
        helpersFlecheAnimationMPath.setAttributeNS("http://www.w3.org/1999/xlink", "href", '#' + tracesHelpers[numeroLigne - 1].id);
        
        helpersFlecheAnimation.appendChild(helpersFlecheAnimationMPath);
        helpersFleche.appendChild(helpersFlecheAnimation);

        document.querySelector('#' + lettre + '-traces-helpers-animation').appendChild(helpersFleche);

        setTimeout(() => {
          helpersElement.style.opacity = 1;
          helpersFleche.style.opacity = 1;
    
        }, 250);
      }

      function removeTracesHelpers(lettre){
        let tracesHelpersContainer = document.querySelector('#' + lettre + '-traces-helpers');
        while(tracesHelpersContainer.firstChild){
          tracesHelpersContainer.removeChild(tracesHelpersContainer.firstChild);
        }
        removeAnimationHelper(lettre);
      }
  
        function removeAnimationHelper(lettre){
          let animationHelpersContainer = document.querySelector('#' + lettre + '-traces-helpers-animation');
          while(animationHelpersContainer.firstChild){
            animationHelpersContainer.removeChild(animationHelpersContainer.firstChild);
          }
        }


    function addTracesActifs(lettre, traces){
      let scaleStrokeWidth = 80;
      if(lettre === 'A'){
        scaleStrokeWidth = 25;
      }

      for(let i=0; i < traces.length; i++){
        let clone = traces[i].cloneNode(true);
        clone.id = lettre + '_actif_' + (i + 1);
        clone.classList.remove(lettre + '-cls-1');
        clone.classList.add(lettre + '-cls-1-actif');
        clone.setAttributeNS(null, 'stroke-linecap', 'round');
        clone.setAttributeNS(null, 'fill', 'none');
        clone.style.transition = 'stroke-dashoffset 100ms ease-out, stroke 300ms ease-out';
        clone.style.strokeDasharray = traces[i].getTotalLength() + 1;
        clone.style.strokeDashoffset = traces[i].getTotalLength() + 1;
        document.querySelector('#' + lettre + '-traces-actif').appendChild(clone);
      }
    
      let tracesActifs = document.querySelectorAll('.' + lettre + '-cls-1-actif');
      let tracesCouleur = window.getComputedStyle(document.querySelector('#' + lettre + '_1'), null)['stroke'];

      for(let i=0; i < tracesActifs.length; i++){
        tracesActifs[i].style.strokeWidth = scaleStrokeWidth + 'px';
        tracesActifs[i].style.stroke = shadeBlendConvert(0.8, tracesCouleur);
        tracesActifs[i].style.opacity = 0;
      }
      return tracesActifs;
    }

        //Eclairci les couleurs rgb
        function shadeBlendConvert(e,t,n){this.sbcRip||(this.sbcRip=function(e){var t=e.length,n=new Object;return 9<t?(e=e.split(","),n[0]=i(e[0].slice(4)),n[1]=i(e[1]),n[2]=i(e[2]),n[3]=e[3]?parseFloat(e[3]):-1):(t<6&&(e="#"+e[1]+e[1]+e[2]+e[2]+e[3]+e[3]+(4<t?e[4]+""+e[4]:"")),e=i(e.slice(1),16),n[0]=e>>16&255,n[1]=e>>8&255,n[2]=255&e,n[3]=9==t||5==t?s((e>>24&255)/255*1e4)/1e4:-1),n});var i=parseInt,s=Math.round,r=9<t.length,c=(r="string"==typeof n?9<n.length||"c"==n&&!r:r,e<0),l=(e=c?-1*e:e,n=n&&"c"!=n?n:c?"#000000":"#FFFFFF",sbcRip(t)),p=sbcRip(n);return r?"rgb("+s((p[0]-l[0])*e+l[0])+","+s((p[1]-l[1])*e+l[1])+","+s((p[2]-l[2])*e+l[2])+(l[3]<0&&p[3]<0?")":","+(-1<l[3]&&-1<p[3]?s(1e4*((p[3]-l[3])*e+l[3]))/1e4:p[3]<0?l[3]:p[3])+")"):"#"+(4294967296+16777216*(-1<l[3]&&-1<p[3]?s(255*((p[3]-l[3])*e+l[3])):-1<p[3]?s(255*p[3]):-1<l[3]?s(255*l[3]):255)+65536*s((p[0]-l[0])*e+l[0])+256*s((p[1]-l[1])*e+l[1])+s((p[2]-l[2])*e+l[2])).toString(16).slice(-1<l[3]||-1<p[3]?1:3)}


      // ============== TRACE DE DEMO (APPARITION) =================
      function traceDeDemo(lettre, traces){

        for(let i = 0; i < traces.length; i++){
          //Longueurs des tracés à 0
          let longueurPath = traces[i].getTotalLength() + 1;
          traces[i].style.strokeDasharray = longueurPath;
          traces[i].style.strokeDashoffset = longueurPath;
          traces[i].style.opacity = 1;
        }

        return new Promise(resolve => {
          setTimeout(() => {
            for(let i = 0; i < traces.length; i++){
              traces[i].style.transition = 'stroke-dashoffset 1.2s cubic-bezier(0.19, 1, 0.22, 1)';

              setTimeout(() => {
                requestAnimationFrame(() => {
                  traces[i].style.strokeDashoffset = 0;
                });
                
              }, i * 1200);
            }

            traces[traces.length - 1].addEventListener('transitionend', async function tracesDeDemoFin(){
              traces[traces.length - 1].removeEventListener('transitionend', tracesDeDemoFin);

              //SON DE LA LETTRE
              // if(typeof(SoundLettreStart) == 'object'){SoundLettreStart.postMessage(lettre);}
                
              let apparitionButtonEnd = await apparitionButton(lettre);
              if(apparitionButtonEnd){resolve(true);}

              resolve(true);
            });
          }, 200);
        });
      }



      function apparitionButton(lettre){
        let boutonSon = document.querySelector('#boutonSon-'+lettre);
        let boutonDepart = document.querySelector('#boutonDepart-'+lettre);
      
        boutonSon.style.transformOrigin = 'center';
        boutonDepart.style.transformOrigin = 'center';
        boutonSon.style.transform = 'scale(0.05)';
        boutonDepart.style.transform = 'scale(0.05)';

        let scaleButton;
        if(lettre === 'A'){scaleButton = 0.75;}

        setTimeout(() => {
          boutonSon.style.transition = 'transform 0.5s';
          boutonSon.style.opacity = 1;
          boutonSon.style.transform = 'scale(' + scaleButton + ')';
        }, 150);
      
        setTimeout(() => {
          boutonDepart.style.transition = 'transform 0.5s';
          boutonDepart.style.opacity = 1;
          boutonDepart.style.transform = 'scale(' + scaleButton + ')';
        }, 450);

        return new Promise(resolve => {
          boutonDepart.addEventListener('transitionend', async function boutonAffichageEnd(){
            boutonDepart.removeEventListener('transitionend', boutonAffichageEnd);
            resolve(true);
          });
        });
      }


  // ============================================================
  // ====================== GAME ENGINE =========================
  // ============================================================
  function startGame(lettre, numeroLigne){
    const tracesActifs = document.querySelectorAll('.' + lettre + '-cls-1-actif');
    const tracesActifTaille = tracesActifs[numeroLigne - 1].getTotalLength() + 1;

    tracesActifs[numeroLigne - 1].style.opacity = 1;

    //  Création d'un tableau Switch On/Off des CheckPoints et ajout d'un ID
    checkPoints = document.querySelectorAll('.' + lettre + '-cls-' + (numeroLigne + 2));
    let checkPointsCheck = [];

    for (let i = 0; i < checkPoints.length; i++){
      checkPoints[i].id = 'tracesActifs-' + numeroLigne + '-' + i;
      if(i == 0 || i == 1){checkPoints[i].style.pointerEvents = 'auto'; }
      checkPointsCheck[i] = false;
    }

    //Démarrage du jeu
    let gameCanStart = false;

    document.querySelector('#gameContainer').addEventListener('touchmove', function gameStartTouchDetect(e){
      let realTarget = document.elementFromPoint(e.changedTouches[0].clientX - window.pageXOffset, e.changedTouches[0].clientY - window.pageYOffset);
      
      if(realTarget){

        //Si c'est la premiere ligne, on vérifie que le bouton de départ soit touché
        if(numeroLigne == 1 && realTarget.parentNode.id == 'boutonDepart-'+lettre){
          document.querySelector('#boutonDepart-'+lettre).style.display = 'none';
          gameCanStart = true;
        }

        //Si ce n'est pas la première ligne, pas besoin d'activer le bouton
        if(numeroLigne > 1){gameCanStart = true;}
        //Le jeu démarre
        if(realTarget.parentNode.id == lettre + '-rect-' + numeroLigne && gameCanStart == true){
          
          //Numéro du checker touché
          let realTargetNumberTemp = realTarget.getAttribute('id').split('-');
          let realTargetNumber = parseInt(realTargetNumberTemp[2]);
          
          //Est-ce que les checkers plus petit ont été activé ?
          let checkerPlusPetit = false;

          for(let i = 0; i < checkPoints.length; i++){
            if(realTargetNumber < 2){}
            else{
              if(i < realTargetNumber && checkPointsCheck[i] == false){
                checkerPlusPetit = true;
              }
            }
          }

          //Pas de plus petit pas activé on lance l'étape
          if(checkerPlusPetit == false){

            //Gestion du switch de checkers et du pointerEvent
            if(realTargetNumber == 0){
              checkPointsCheck[0] = true;
              checkPoints[0].style.pointerEvents = 'none';
            }
            else if (realTargetNumber == 1){
              checkPointsCheck[0] = true;
              checkPointsCheck[1] = true;
              checkPoints[0].style.pointerEvents = 'none';
              checkPoints[1].style.pointerEvents = 'none';
              checkPoints[2].style.pointerEvents = 'auto';
            }
            else{
              checkPointsCheck[realTargetNumber] = true;
              if(realTargetNumber + 1 < checkPoints.length){
                checkPoints[realTargetNumber].style.pointerEvents = 'none';
                checkPoints[realTargetNumber + 1].style.pointerEvents = 'auto';
              } else if (realTargetNumber + 1 == checkPoints.length) {
                checkPoints[realTargetNumber].style.pointerEvents = 'none';
              }
            }
            
            //Animation du tracé actif
            tracesActifs[numeroLigne - 1].style.strokeDashoffset = tracesActifTaille - ((realTargetNumber + 1) * (tracesActifTaille / checkPoints.length));

            //Tracé fini
            if(realTargetNumber + 1 == checkPoints.length){
              //Fin du Helper
              removeAnimationHelper(lettre);
              
              //Bouge le tracé actif dans le bloc Actif Fini
              document.querySelector('#' + lettre + '-traces-actif-fini').appendChild(
                tracesActifs[numeroLigne - 1]
              );
              let tracesCouleur = window.getComputedStyle(document.querySelector('#' + lettre + '_1'), null)['stroke'];
              tracesActifs[numeroLigne - 1].style.stroke = shadeBlendConvert(0.4, tracesCouleur);

              document.removeEventListener('touchmove', gameStartTouchDetect);

              //On vérifie si il y a un autre tracé
              if(tracesActifs.length > numeroLigne){
                startAnimationHelper(lettre, (numeroLigne + 1));
                startGame(lettre, (numeroLigne + 1));
              }

              //VICTOIRE
              else{
                setTimeout(() => {
                  for(let i = 0; i < tracesActifs.length; i++){
                    tracesActifs[i].style.stroke = shadeBlendConvert(0.8, tracesCouleur);
                  }
                }, 500); 

                setTimeout(() => {
                  // document.querySelector('#victoryScreen').style.display = 'flex';
                  animationVictoire(lettre);
                }, 900);

              }
            }


          }
        }
      }
    });

  }





  

  // ============================================================
  // ================== ANIMATION VICTOIRE ======================
  // ============================================================


  function animationVictoire(lettre){
    const victoryScreen = document.querySelector('#victoryScreen');
    const victoryScreenBackground = document.querySelector('#victoryScreenBackground');

    const victoryScreenSVGMains = document.querySelector('#victoryScreenSVGMains');
    const victoryScreenMainBasse = document.querySelector('#victoryScreenMainBasse');
    const victoryScreenMainHaute = document.querySelector('#victoryScreenMainHaute');

    const victoryScreenSVGFormes = document.querySelector('#victoryScreenSVGFormes');
    const victoryScreenSVGFormesAnimation = document.querySelector('#victoryScreenSVGFormesAnimation');


    //Fond Noir
    victoryScreen.style.display = 'block';
  
    victoryScreenBackground.style.transition = 'opacity 0.7s ease-out';
    victoryScreenSVGMains.style.transition = 'opacity 0.7s ease-out';
    victoryScreenMainHaute.style.transition = 'transform 0.5s ease-out';
    victoryScreenMainBasse.style.transition = 'transform 0.5s ease-out';

    victoryScreenSVGFormesAnimation.style.transition = 'opacity 0.3s ease-out';


    setTimeout(() => {
      victoryScreenBackground.style.opacity = 0.5;
    },100);

    //Mains
    setTimeout(() => {
      victoryScreenSVGMains.style.opacity = 1;

      //Mains s'écarte
      victoryScreenMainHaute.style.transform = 'translate(-2%, -5%) scale(1.09)';
      victoryScreenMainBasse.style.transform = 'translate(1%, 3%) scale(0.94)';

      setTimeout(() => {
        victoryScreenMainHaute.style.transition = 'transform 0.2s ease-in';
        victoryScreenMainBasse.style.transition = 'transform 0.2s ease-in';

        victoryScreenMainHaute.style.transform = 'translate(0%, 0%) scale(1)';
        victoryScreenMainBasse.style.transform = 'translate(0%, 0%) scale(1)';

        setTimeout(() => {
          document.querySelector('#victoryScreenMainEffets1').style.opacity = 1;
          document.querySelector('#victoryScreenMainEffets2').style.opacity = 1;

          setTimeout(() => {
            document.querySelector('#victoryScreenMainEffets1').style.opacity = 0;
            document.querySelector('#victoryScreenMainEffets2').style.opacity = 0;
          }, 200);

          victoryScreenMainHaute.style.transition = 'transform 0.4s ease-out';
          victoryScreenMainBasse.style.transition = 'transform 0.4s ease-out';
          victoryScreenMainHaute.style.transform = 'translate(-2%, -5%) scale(1.09)';
          victoryScreenMainBasse.style.transform = 'translate(1%, 3%) scale(0.94)';

          setTimeout(() => {
            victoryScreenMainHaute.style.transition = 'transform 0.2s ease-out';
            victoryScreenMainBasse.style.transition = 'transform 0.2s ease-out';
            victoryScreenMainHaute.style.transform = 'translate(0%, 0%) scale(1)';
            victoryScreenMainBasse.style.transform = 'translate(0%, 0%) scale(1)';

            setTimeout(() => {
              document.querySelector('#victoryScreenMainEffets1').style.opacity = 1;
              document.querySelector('#victoryScreenMainEffets2').style.opacity = 1;

              setTimeout(() => {
                document.querySelector('#victoryScreenMainEffets1').style.opacity = 0;
                document.querySelector('#victoryScreenMainEffets2').style.opacity = 0;
              }, 100);

              victoryScreenMainHaute.style.transition = 'transform 0.2s ease-out';
              victoryScreenMainBasse.style.transition = 'transform 0.2s ease-out';

              victoryScreenMainHaute.style.transform = 'translate(-2%, -4%) scale(1.05)';
              victoryScreenMainBasse.style.transform = 'translate(1%, 2.5%) scale(0.96)';

              setTimeout(() => {
                victoryScreenMainHaute.style.transform = 'translate(0%, 0%) scale(1)';
                victoryScreenMainBasse.style.transform = 'translate(0%, 0%) scale(1)';

                setTimeout(() => {
                  document.querySelector('#victoryScreenMainEffets1').style.opacity = 1;
                  document.querySelector('#victoryScreenMainEffets2').style.opacity = 1;
                }, 200);
              },200)


            }, 200);


            //DOOM
            setTimeout(() => {

              if(lettre != 'B'){
                doomScene(lettre, alphabetArray[alphabetArray.indexOf(lettre) + 1])
              }

            }, 2000);

          }, 400);

        }, 200);
      },500);

    }, 780);

    setTimeout(() => {
      //Effets
      victoryScreenSVGFormesAnimation.style.opacity = 1;

      let translateInfos = [
        'translate(-6%, -68%)',
        'translate(-15%, -52%)',
        'translate(-24%, -56%)',
        'translate(-23%, -24%)',
        'translate(-30%, -24%)',
        'translate(-27%, -17%)',
        'translate(-72%, -45%)',
        'translate(-74%, -33%)',
        'translate(-85%, -38%)',
        'translate(-78%, -72%)',
        'translate(-81%, -66%)',
        'translate(-92%, -73%)',
      ];

      for(let i = 0; i < translateInfos.length; i++){
        
        let victoireSVGFormeClone = document.querySelector('#victoryScreenSVGForm-' + (i + 1)).cloneNode(true);
   
          victoireSVGFormeClone.style.transform = translateInfos[i];
        
        victoireSVGFormeClone.style.id = 'cloneVictoireFormeAnimation-' + (i + 1);

        let victoireAnimationSVGForm = document.createElementNS("http://www.w3.org/2000/svg", "animateMotion");
        victoireAnimationSVGForm.setAttributeNS(null, 'id', 'animationTest');
        victoireAnimationSVGForm.setAttributeNS(null, 'dur', '3s');
        victoireAnimationSVGForm.setAttributeNS(null, 'fill', 'freeze');
        victoireAnimationSVGForm.setAttributeNS(null, 'begin', 'indefinite');
        victoireAnimationSVGForm.setAttributeNS(null, 'from', '0%');
        victoireAnimationSVGForm.setAttributeNS(null, 'to', '100%');
        victoireAnimationSVGForm.setAttributeNS(null, 'calcMode', 'spline');
        victoireAnimationSVGForm.setAttributeNS(null, 'keyTimes', '0;1');
        victoireAnimationSVGForm.setAttributeNS(null, 'keySplines', '0 1 0.15 1');
        victoireAnimationSVGForm.setAttributeNS(null, 'repeatCount', '1');

        let victoireAnimationSVGFormMPath = document.createElementNS("http://www.w3.org/2000/svg", 'mpath');
        victoireAnimationSVGFormMPath.setAttributeNS("http://www.w3.org/1999/xlink", "href", '#victoryScreenSVGFormPath-' + (i + 1));
        victoireAnimationSVGForm.appendChild(victoireAnimationSVGFormMPath);

        
        

        victoireSVGFormeClone.appendChild(victoireAnimationSVGForm);

        // victoireAnimationSVGForm.beginElement();
        document.querySelector('#victoryScreenSVGFormesAnimation').appendChild(victoireSVGFormeClone);

        victoireAnimationSVGForm.beginElement();
        
      }
    }, 1200);



  }





  

  // ============================================================
  // ================== DOOM LA LETTRE / REBOOT =================
  // ============================================================

  //Supprime tous les listener et tracés dynamiques et démarre une nouvelle lettre
  function doomScene(lettreActuelle, lettreDemande){

    const screenDeTransition = document.querySelector('#screenDeTransition');

    screenDeTransition.style.display = 'block';
    screenDeTransition.style.transition = 'all 0.5s linear';

    setTimeout(() => {
      
      screenDeTransition.style.opacity = 1;
    },100);
    

    setTimeout(() => {
      
      if(alphabetArray.indexOf(lettreDemande) < 2){ //A ajuster avec le nombre de tracé FIX

        var old_element = document.body;
        var new_element = old_element.cloneNode(true);
        old_element.parentNode.replaceChild(new_element, old_element);

        document.body.innerHTML = HTMLInitial;
        setTimeout(() => {
          // initialisation(lettreDemande);
        },700);
        
      }
    },600);




  }

On iphone 6 the animations on the webview is perfectly smooth but on my Galaxy S9 is very slow. But on my Galaxy S9 with Chrome app is perfectly smooth.

Webview animation is slow on Android #52211

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