Fix display of warning text in Edge when Windows High Contrast Mode is enabled #2186
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When Windows High Contrast Mode (HCM) is enabled for Edge, the warning text icon is affected by the readability backplate [1] which draws a box around the exclamation mark, obscuring parts of the circle. Opt out of the readability backplate by setting `forced-color:adjust: none` and handle it ourselves, by overriding the colors to system colours in a media query which detects if forced colors are active. Use `forced-color-adjust` and `forced-colors` over the MS specific `-ms-high-contrast-adjust: none;` and `-ms-high-contrast: active` to allow for future support from other browsers (e.g. Firefox, which allows users to set their own colour scheme for pages). HCM with IE11 does not seem to be affected by the same issue – I don’t think it implements a readability backplate. [1]: https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/6208eaffa0362ca107644c99b902c0b06bd5a0c8/Accessibility/HighContrast/explainer.md#ensuring-readability
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We have the same issue in Firefox, which this unfortunately doesn't fix, because Firefox doesn't support the |
vanitabarrett
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Apr 14, 2021
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When Windows High Contrast Mode (HCM) is enabled for Edge, the warning text icon is affected by the readability backplate which draws a box around the exclamation mark, obscuring parts of the circle.
Opt out of the readability backplate by setting
forced-color:adjust: noneand handle it ourselves, by overriding the colors to system colours in a media query which detects if forced colors are active.Use
forced-color-adjustandforced-colorsover the MS specific-ms-high-contrast-adjust: none;and-ms-high-contrast: activeto allow for future support from other browsers (e.g. Firefox, which allows users to set their own colour scheme for pages).HCM with IE11 does not seem to be affected by the same issue – I don’t think it implements a readability backplate.