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Returns whether the property is valid, invalid, or unrecognized.
Note These APIs can only be used with F12 developer tools and the Diagnostics Script Engine, and can't be called from JavaScript.
This property is read-only.
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Syntax
| JavaScript |
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Property values
Type: DOMString
One of the following strings:
- Valid
- InvalidValue
- UnrecognizedProperty (a.k.a. an expando)