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feat: add transparent webpreference to webview (#40301)

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* feat: add transparent option to WebContents

* feat: add transparent attribute to webview

* test: add tests for webview transparent attribute

* docs: add transparent attribute to webview docs

* fix: run tests on macOS only

* refactor: remove unneeded html tag

* fix: only apply transparent option to guests

* refactor: correct comment

* refactor: use opaque instead

Retains current webview behaviour by default.

* fix: correct variable name to guest_opaque_

* refactor: use transparent webpreference

* docs: remove unused web preference

* fix: uncomment condition for transparency test

* docs: converted to list format and linked to MDN

* fix: make webviews transparent by default again

* fix: rebase error

---------

Co-authored-by: Cheng Zhao <zcbenz@gmail.com>
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Brandon Fowler 2024-01-04 23:00:27 -05:00 • committed by GitHub
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docs/api/webview-tag.md
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@ -221,7 +221,9 @@ windows. Popups are disabled by default.
```
A `string` which is a comma separated list of strings which specifies the web preferences to be set on the webview.
The full list of supported preference strings can be found in [BrowserWindow](browser-window.md#new-browserwindowoptions).
The full list of supported preference strings can be found in [BrowserWindow](browser-window.md#new-browserwindowoptions). In addition, webview supports the following preferences:
* `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.
The string follows the same format as the features string in `window.open`.
A name by itself is given a `true` boolean value.