Xidorn Quan

I think the goal is to prevent a background window from going fullscreen silently, so probably we want to check whether the document or the top browsing context of document...

`document.activeElement` doesn't become null. `focus` and `blur` would be fired when switching between windows, but changing the focus to address bar also triggers `blur`. If it is not allowed to...

It seems to me `isolation` makes the element create a stacking context, and top layer also makes element create a stacking context, so the element create a stacking context, there...

It doesn't seem to me Firefox suppresses the shortcuts when in fullscreen. As far as I can see, if you Ctrl-T in fullscreen, Firefox also opens a new tab and...

And it seems to me Edge doesn't suppress them either.

I think that is unrelated to fullscreen at all. Firefox seems to always allow the content overriding those keyboard shortcuts via `preventDefault()`, no matter whether it is in fullscreen or...

Whether the ancestor elements are visible doesn't matter, but whether they exist matters. The page has rules like ```css :-moz-full-screen-ancestor>:not(:-moz-full-screen-ancestor):not(:-moz-full-screen) { display:none!important } /* as well as those with other...

That's not moz-prefixed specific, they have similar rules for all vendor prefixes as well as unprefixed `:fullscreen-ancestor`: ```css :-webkit-full-screen-ancestor>:not(:-webkit-full-screen-ancestor):not(:-webkit-full-screen) { display:none!important } :-moz-full-screen-ancestor>:not(:-moz-full-screen-ancestor):not(:-moz-full-screen) { display:none!important } :-ms-fullscreen-ancestor>:not(:-ms-fullscreen-ancestor):not(:-ms-fullscreen) { display:none!important }...

Oh this is about `perspective` property... I was talking about `-webkit-transform: perspective()`. Anyway, there are several questions regarding the numbers: * Does the number exclude forms like `-webkit-perspective: 500; perspective:...

So I investigated several sample urls listed under the statistics, specifically: * http://www.preparedfoods.com/ * http://www.searchstorage.de/ * http://www.retetepractice.ro/ * http://www.decopeques.com/ * http://www.egerton.ac.ke/ I don't find any usage of `perspective` in the...