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- // Copyright 2020 Google Inc.
- //
- // Permission is hereby granted, free of charge, to any person obtaining a copy
- // of this software and associated documentation files (the "Software"), to deal
- // in the Software without restriction, including without limitation the rights
- // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- // copies of the Software, and to permit persons to whom the Software is
- // furnished to do so, subject to the following conditions:
- //
- // The above copyright notice and this permission notice shall be included in
- // all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- // THE SOFTWARE.
- @use '@material/feature-targeting/feature-targeting';
- @use '@material/rtl/rtl';
- ///
- /// Emits necessary layout styles to set a transparent border around an element
- /// without interfering with the rest of its component layout. The border is
- /// only visible in high-contrast mode. The target element should be a child of
- /// a relatively positioned top-level element (i.e. a ::before pseudo-element).
- ///
- /// @param {number} $border-width - The width of the transparent border.
- /// @param {string} $border-style - The style of the transparent border.
- ///
- @mixin transparent-border(
- $border-width: 1px,
- $border-style: solid,
- $query: feature-targeting.all()
- ) {
- $feat-structure: feature-targeting.create-target($query, structure);
- @include feature-targeting.targets($feat-structure) {
- position: absolute;
- box-sizing: border-box;
- width: 100%;
- height: 100%;
- top: 0;
- @include rtl.ignore-next-line();
- left: 0;
- border: $border-width $border-style transparent;
- border-radius: inherit;
- content: '';
- pointer-events: none;
- }
- // Used to satisfy Firefox v94 which does not render transparent borders in HCM (b/206440838).
- @include forced-colors-mode($exclude-ie11: true) {
- @include feature-targeting.targets($feat-structure) {
- border-color: CanvasText;
- }
- }
- }
- ///
- /// Visually hides text content for accessibility. This text should only be
- /// visible to screen reader users.
- /// See https://a11yproject.com/posts/how-to-hide-content/
- ///
- @mixin visually-hidden($query: feature-targeting.all()) {
- $feat-structure: feature-targeting.create-target($query, structure);
- @include feature-targeting.targets($feat-structure) {
- clip: rect(1px, 1px, 1px, 1px);
- height: 1px;
- overflow: hidden;
- position: absolute;
- white-space: nowrap; /* added line */
- width: 1px;
- }
- }
- /// Selects for IE11 support.
- ///
- /// @content styles to emit for IE11 support
- @mixin ie11-support {
- @media all and (-ms-high-contrast: none), (-ms-high-contrast: active) {
- @content;
- }
- }
- /// Selects for `forced-colors` high contrast mode.
- ///
- /// While in `forced-colors` mode, only system colors should be used.
- ///
- /// @link https://developer.mozilla.org/en-US/docs/Web/CSS/color_value#system_colors
- /// @link https://developer.mozilla.org/en-US/docs/Web/CSS/@media/forced-colors
- /// @content styles to emit in `forced-colors` mode
- @mixin forced-colors-mode($exclude-ie11: false) {
- @if $exclude-ie11 {
- @media screen and (forced-colors: active) {
- @content;
- }
- } @else {
- @media screen and (forced-colors: active), (-ms-high-contrast: active) {
- @content;
- }
- }
- }
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