Isabelle Dubach has shown me that she can't abort the move operation on the corporate website in some browsers. She starts by selecting the component edit bar, then clicking on the move icon. This causes the bar to attach to the mouse pointer. Isa solves this by reloading the page in order to abort the "move".
I've verified this with a set of recent browsers and have updated the findings accordingly. The c*urrent status with 5.4.1 is that clicking on the background seems to work in all browsers I've tested, while ESC only works in Firefox*.
In OS X 10.10.5 (14F27), tested with MTE /travel/about page:
- Safari 8.0.8: clicking on bkgr works, ESC doesn't work.
- Firefox 40.0.3: ESC and click on bkgr works
On Windows 10 (11.31193.0), tested with MTE /travel/about page:
- Internet Explorer 11.0.22: Clicking on bkgr works, ESC doesn't work.
- Microsoft Edge 20.10240: Clicking on bkgr works, ESC doesn't work.