STR: 1. Open the attachment. 2. Press the button. => observe that the element seems to be clipped in the initial box. I tried in Firefox 42 that I happened to have, Firefox Stable (44) Aurora (45) Nightly (47, 20160128030208), and all are failing this testcase. Chromium 48.0.2564.82 makes this work properly.
I also realize that changing the value in the devtools' inspector does not change anything in the page until I hover the node in the devtools...
I'm not 100% shure if I'm dealing with the same bug. In my case this bug appears when css-attribute is changed on :hover. Just as in the described case there is a workaround by changing some other attributes of the element as well (eg. height, background-color, border, etc.). In chrome the problem does not appear. I made 2 codepens to show the problem and my workaround. Hover the elevator and see what happens: https://codepen.io/enlightenment/pen/QNmeBJ fixed codepen: https://codepen.io/enlightenment/pen/NNYQLL
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