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fix: corner smoothing feature gate crash (#47785)

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* fix: corner smoothing feature gate crash

Co-authored-by: clavin <clavin@electronjs.org>

* Fix ElectronCornerSmoothing::CSSValueFromComputedStyleInternal

Co-authored-by: clavin <clavin@electronjs.org>

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: clavin <clavin@electronjs.org>
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trop[bot] 2025-07-16 12:15:53 -07:00 • committed by GitHub
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6
docs/api/corner-smoothing-css.md
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@ -51,19 +51,17 @@ Use the `system-ui` keyword to match the smoothness to the OS design language.
### Controlling availibility
This CSS rule can be disabled by setting [the `cornerSmoothingCSS` web preference](./structures/web-preferences.md) to `false`.
This CSS rule can be disabled using the Blink feature flag `ElectronCSSCornerSmoothing`.
```js
const myWindow = new BrowserWindow({
// [...]
webPreferences: {
enableCornerSmoothingCSS: false // Disables the `-electron-corner-smoothing` CSS rule
disableBlinkFeatures: 'ElectronCSSCornerSmoothing' // Disables the `-electron-corner-smoothing` CSS rule
}
})
```
The CSS rule will still parse, but will have no visual effect.
### Formal reference
* **Initial value**: `0%`

1
docs/api/structures/web-preferences.md
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@ -149,7 +149,6 @@
`WebContents` when the preferred size changes. Default is `false`.
* `transparent` boolean (optional) - Whether to enable background transparency for the guest page. Default is `true`. **Note:** The guest page's text and background colors are derived from the [color scheme](https://developer.mozilla.org/en-US/docs/Web/CSS/color-scheme) of its root element. When transparency is enabled, the text color will still change accordingly but the background will remain transparent.
* `enableDeprecatedPaste` boolean (optional) _Deprecated_ - Whether to enable the `paste` [execCommand](https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand). Default is `false`.
* `enableCornerSmoothingCSS` boolean (optional) _Experimental_ - Whether the [`-electron-corner-smoothing` CSS rule](../corner-smoothing-css.md) is enabled. Default is `true`.
[chrome-content-scripts]: https://developer.chrome.com/extensions/content_scripts#execution-environment
[runtime-enabled-features]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/platform/runtime_enabled_features.json5