The Remix editor recompiles the code each time the current file is changed or another file is selected. It also provides syntax highlighting mapped to solidity keywords.

Here's the list of some important features:

• It display opened files as tabs.
• Compilation Warning and Error are displayed in the gutter
• Remix saves the current file continuously (5s after the last changes)
• +/- on the top left corner enable you to increase/decrease the font size of the editor