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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/prefix below:

Element: prefix property - Web APIs

Element: prefix property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The Element.prefix read-only property returns the namespace prefix of the specified element, or null if no prefix is specified.

Value

A string.

Examples

The following logs "x" to the console.

xml

<x:div onclick="console.log(this.prefix)"/>
Notes

This will only work when a namespace-aware parser is used, i.e., when a document is served with an XML MIME type. This will not work for HTML documents.

Specifications Specification DOM
# ref-for-dom-element-prefix①
Browser compatibility See also

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