Created attachment 193939 [details] Screencast of the bug in progress Go to webkit.org. Select `green.css` in the resource list. In the main area, you can now edit the text. Try to add a new rule. Something like this: .foo { background: none; } Don't just copy/paste it; actually type it. When you stop typing for a moment, the editor will jump the cursor back to the first character of the text field, and sometimes remove some of the text you typed too. It's annoying. Screencast attached.
<rdar://problem/13457053>
I have a fix out for review.
This will be fixed in the next nightly build.