gecko-dev/layout/style/full-screen-override.css

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CSS

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
*|*:-moz-full-screen-ancestor {
/* Ancestors of a full-screen element should not induce stacking contexts
that would prevent the full-screen element from being on top. */
z-index: auto;
/* Ancestors of a full-screen element should not be partially transparent,
since that would apply to the full-screen element and make the page visible
behind it. It would also create a pseudo-stacking-context that would let content
draw on top of the full-screen element. */
opacity: 1;
/* Ancestors of a full-screen element should not apply SVG masking, clipping, or
filtering, since that would affect the full-screen element and create a pseudo-
stacking context. */
mask: none;
clip: auto;
filter: none;
-moz-transform: none;
will-change: auto;
}