web-feature: Customized built-in elements

Customized built-in elements are HTML elements that extend built-in elements using the is attribute, to add new behaviors that you define.

WKWebView

macOS

*

iOS

*

Android WebView

Android

*

WebView2

Windows

*

Chrome Browser

Android

67

Safari Browser

iOS

*

Notes

Support data provided by: BCD logo

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This feature was last updated on November 22, 2025.