chrome-devtools-frontend
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Chrome DevTools UI
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# Invalid element or text node within <optgroup>
An element which is not allowed in the content model of the `<optgroup>` element was found within an `<optgroup>` element. These elements will not consistently be accessible to people navigating by keyboard or using assistive technology.
If using disallowed elements for layout structure and styling, consider using the allowed `<div>` element instead.
Any text existing within the `<optgroup>` element should either be removed or relocated to a valid element that allows text descendants, e.g., the `<legend>` or `<option>` elements.