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fix(Alert): add high contrast mode border via enhanceHighContrast #48731

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fix(Alert): add high contrast mode border via enhanceHighContrast #48731

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fix(Alert): add high contrast mode border via enhanceHighContrast
kartikjsonawane Jun 25, 2026
e09fad7
fix(Alert): explicitly set color and backgroundColor for filled varia…
kartikjsonawane Jun 25, 2026
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28 changes: 28 additions & 0 deletions packages/mui-material/src/styles/enhanceHighContrast.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import alertClasses from '../Alert/alertClasses';
import accordionSummaryClasses from '../AccordionSummary/accordionSummaryClasses';
import autocompleteClasses from '../Autocomplete/autocompleteClasses';
import checkboxClasses from '../Checkbox/checkboxClasses';
Expand Down Expand Up @@ -115,6 +116,33 @@ export default function enhanceHighContrast<
const c = theme.components;
theme.components = {
...c,
MuiAlert: {
...c?.MuiAlert,
styleOverrides: {
...c?.MuiAlert?.styleOverrides,
root: [
c?.MuiAlert?.styleOverrides?.root,
{
// All variants lack a visible border in HCM — add one so the
// alert region is distinguishable from the surrounding canvas.
[HCM]: {
outline: `1px solid ${hcTokens.buttonBorder}`,
},
// The filled variant uses background colour to convey severity;
// in HCM backgrounds are overridden by the OS, so explicitly set
// foreground/background using system color tokens to preserve contrast.
[`&.${alertClasses.filled}`]: {
[HCM]: {
forcedColorAdjust: 'none',

@mj12albert mj12albert Jun 25, 2026

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Is this enough? filled alert styles also define color/backgroundColor

outline: `2px solid ${hcTokens.buttonBorder}`,
color: hcTokens.buttonText,
backgroundColor: hcTokens.activeBackground,
},
},
},
],
},
},
MuiAccordionSummary: {
...c?.MuiAccordionSummary,
styleOverrides: {
Expand Down
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