Dão Gottwald
759f86dd9e
`[hidden]` is implemented as a low-priority presentation attribute (see the
comment in layout/style/res/html.css), so any author rule setting `display`
silently overrides it. A lot of chrome/in-content CSS therefore guards
display-setting rules with `:not([hidden])` so the element still hides when the
`hidden` attribute is set.
Add a `:where([hidden]) { display: none !important }` rule to the two base
stylesheets -- global-shared.css (chrome) and in-content/common-shared.css
(in-content pages) -- so callers can set a `display` type unconditionally, and
drop the redundant `:not([hidden])` guards. `:where()` keeps the selector at
zero specificity, so the rare element that must stay shown can override it with
a plain `!important`: findbar[hidden] (slide transition), treecol[hidden] in
xul.css (column collapse), setting-control[hidden]:has(> moz-message-bar), and
the devtools toolbox webconsole/deck panels (kept laid out via visibility).
Guards are kept where the base rule can't reach: shadow-DOM widgets, the
newtab/activity-stream bundle, browser/fxr/*, and mixed-coverage sheets injected
into content documents or shadow roots (urlbar view sheets via the smartbar,
feature-callout sheets). Structural `:not([hidden])` uses (sibling/descendant
combinators) are untouched.
Also fix the moreFromMozilla QR-code box, which showed itself by setting
hidden="false". Since bug 1979014 made `hidden` a regular boolean attribute,
that value is actually hidden, so it now removes the attribute instead (and the
matching :not([hidden="true"]) CSS guards become a plain selector).
Differential Revision: https://phabricator.services.mozilla.com/D309290
16 lines
641 B
CSS
16 lines
641 B
CSS
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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.extension-controlled-message-bar,
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.reenable-extensions-message-bar {
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margin-block-end: var(--space-large);
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}
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/* Re-show an otherwise-hidden control when it carries a message bar.
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`!important` to beat the global `[hidden] { display: none !important }` rule. */
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setting-control[hidden]:has(> moz-message-bar):not([slot="nested"], :last-child) {
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display: block !important;
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margin-block-start: calc(-1 * var(--space-large));
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}
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