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Remove polyfills natively supported across the browser support matrix #127

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Initial plan
Copilot Sep 14, 2026
ca6714c
Remove polyfills no longer needed under supported browser policy
Copilot Sep 14, 2026
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70 changes: 0 additions & 70 deletions docs/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -489,48 +489,6 @@ <h1>GitHub Feature Support Table</h1>
<th></th>
<th colspan="7"><h3>Polyfilled Features</h3></th>
</tr>
<tr>
<th>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/ClipboardItem">
<code>ClipboardItem</code>
</a>
</th>
<td data-polyfill="clipboardItem"><div>*</div></td>
<td data-supported="true" title="Buggy implementation"><div>66+ †</div></td>
<td data-supported="true" title="Buggy implementation"><div>79+ †</div></td>
<td data-supported="true" title="Flagged implementation"><div>87+ †</div></td>
<td data-supported="true"><div>13.1+</div></td>
<td data-supported="true" title="Buggy implementation"><div>53+ †</div></td>
<td data-supported="true" title="Buggy implementation"><div>9.0+ †</div></td>
</tr>
<tr>
<th>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/checkVisibility">
<code>Element.checkVisibility</code>
</a>
</th>
<td data-polyfill="elementCheckVisibility"><div>*</div></td>
<td data-supported="true"><div>105+</div></td>
<td data-supported="true"><div>105+</div></td>
<td data-supported="true"><div>106+</div></td>
<td data-supported="true"><div>17.4+</div></td>
<td data-supported="true"><div>91+</div></td>
<td data-supported="true"><div>20.0+</div></td>
</tr>
<tr>
<th>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/Clipboard">
<code>navigator.clipboard</code>
</a>
</th>
<td data-polyfill="navigatorClipboard"><div>*</div></td>
<td data-supported="true"><div>86+</div></td>
<td data-supported="true"><div>79+</div></td>
<td data-supported="true"><div>63+ †</div></td>
<td data-supported="true"><div>13.1+</div></td>
<td data-supported="true"><div>63+ †</div></td>
<td data-supported="true"><div>12.0+ †</div></td>
</tr>
<tr>
<th>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/requestIdleCallback">
Expand All @@ -545,34 +503,6 @@ <h1>GitHub Feature Support Table</h1>
<td data-supported="true"><div>34+</div></td>
<td data-supported="true"><div>5.0+</div></td>
</tr>
<tr>
<th>
<a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover">
<code>HTMLElement.popover</code>
</a>
</th>
<td data-polyfill="popover"><div>*</div></td>
<td data-supported="true"><div>114+</div></td>
<td data-supported="true"><div>114+</div></td>
<td data-supported="true"><div>125+</div></td>
<td data-supported="true"><div>17+</div></td>
<td data-supported="true"><div>100+</div></td>
<td data-supported="true"><div>23.0+</div></td>
</tr>
<tr>
<th>
<a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/popover">
<code>HTMLElement.popover = 'hint'</code>
</a>
</th>
<td data-polyfill="popover"><div>*</div></td>
<td data-supported="true"><div>114+</div></td>
<td data-supported="true"><div>114+</div></td>
<td data-supported="true"><div>125+</div></td>
<td data-supported="true"><div>17+</div></td>
<td data-supported="true"><div>+</div></td>
<td data-supported="true"><div>12.0+</div></td>
</tr>
<tr>
<th>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/beforetoggle_event">
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7 changes: 0 additions & 7 deletions package-lock.json
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1 change: 0 additions & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,6 @@
"typescript": "^5.2.2"
},
"dependencies": {
"@oddbird/popover-polyfill": "^0.5.2",
"invokers-polyfill": "^0.5.2"
},
"overrides": {
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47 changes: 0 additions & 47 deletions src/clipboarditem.ts
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50 changes: 0 additions & 50 deletions src/element-checkvisibility.ts
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This file was deleted.

20 changes: 0 additions & 20 deletions src/index.ts
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Original file line number Diff line number Diff line change
@@ -1,15 +1,5 @@
import * as clipboardItem from './clipboarditem.js'
import * as elementCheckVisibility from './element-checkvisibility.js'
import * as navigatorClipboard from './navigator-clipboard.js'
import * as withResolvers from './promise-withResolvers.js'
import * as requestIdleCallback from './requestidlecallback.js'
import * as popover from '@oddbird/popover-polyfill/fn'
import * as commandAndCommandFor from 'invokers-polyfill/fn'
import * as objectGroupBy from './object-groupby.js'
import * as mapGroupBy from './map-groupby.js'
import * as promiseTry from './promise-try.js'
import * as iteratorHelpers from './iterator-helpers.js'
import * as setMethods from './set-methods.js'

let supportsModalPseudo = false
try {
Expand Down Expand Up @@ -51,18 +41,8 @@ export const baseSupport =
true

export const polyfills = {
clipboardItem,
elementCheckVisibility,
navigatorClipboard,
requestIdleCallback,
withResolvers,
popover,
commandAndCommandFor,
objectGroupBy,
mapGroupBy,
promiseTry,
iteratorHelpers,
setMethods,
}

export function isSupported() {
Expand Down
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