Heads up! This blog post hasn't been updated in over 2 years. CodePen is an ever changing place, so if this post references features, you're probably better off checking the docs. Get in touch with support if you have further questions.
Here’s something new you can do in CodePen’s mobile editor:
Copy and paste! Seems pretty obvious, but this wasn’t possible before and is a huge upgrade.
tested on iOS, Android Chrome, stock Android browser
CodeMirror 5.0 introduced this, so high five to Marijn Haverbeke and anyone else who contributed to that.