Bug 175018

Live example here: https://jsfiddle.net/nxja91tc/4/ If there’s HTML like this: <div id="outer"> <div id="inner"> </div> </div> With CSS like this: div { width: 100px; height: 100px; } #inner { background-color: blue; will-change: transform; } #outer { overflow: hidden; border-radius: 20px; background-color: red; will-change: transform; } Then disabling the border-radius of #outer (with JavaScript) to 0px will indeed disable the border radius, but only for #outer. The #inner div will stay clipped, causing red corners to show that should have been overlapped with blue.