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Sass Mixin for focus stiles with :focus-visble via the WICG polyfill
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| @mixin focus( | |
| $focus-color: null, | |
| $focus-not-visible-color: null, | |
| $focus-bg-color: null, | |
| $focus-not-visible-bg-color: null, | |
| $text-decoration: null, | |
| $focus-not-visible-text-decoration: null, | |
| $focus-outline: null, | |
| $focus-outline-offset: null | |
| ) { | |
| // Set focus highlighting for all use cases | |
| &:focus { | |
| color: $focus-color; | |
| background: $focus-bg-color; | |
| text-decoration: $text-decoration; | |
| outline: $focus-outline; | |
| outline-offset: $focus-outline-offset; | |
| } | |
| // Progressive Enhancement: reset focus highlighting only if | |
| // 1) the :focus-visible polyfill is active (guarded by reverse parent selector for | |
| // a class on the html element) | |
| // 2) the polyfill determined that the input method does not warrant focus highlighting | |
| // (guarded by check for a class on the element the user is interacting with) | |
| .js-focus-visible & { // [1] | |
| &:focus:not(.focus-visible) { // [2] | |
| color: $focus-not-visible-color; | |
| background-color: $focus-not-visible-bg-color; | |
| text-decoration: $focus-not-visible-text-decoration; | |
| outline: 0; | |
| } | |
| } | |
| } |
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