Write it. Run it. Keep it.
A free account saves what you write, so you can pick it up on any device.
Free to use, nothing to sign up for
Online code editor
HTML, CSS and JavaScript in three panes, with the page they make beside them.
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Teaching a class? The same editor, with tests, hand-ins and marking, is the Learning Platform, free to try.
How it works, in the manual: Running a class with nothing installed.