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I had this on my previous question where id I defined the attribute "required" as a boolean validation would fail is there a list of these "reserved" attributes and their names for LWC Aura

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    Again, it's either Aura or LWC. They are two different technologies and follow different rules. Presumably, you're asking about Aura, so LWC should not be in the question title. – sfdcfox May 16 at 21:53
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In Aura, you must begin attributes with a letter or underscore, and must contain only letters, numbers, and underscores. Documentation.

In LWC, you must not start any attribute name with on, aria, or data. You may not use the specific attribute names slot, part, or is. It is recommended that you do not start with an uppercase character, because it requires special syntax to address such properties. It is recommended you do not use HTML global attributes, but you can use them if you decorate them with @api. You must begin attributes with a letter or underscore, and must only contain letters, numbers, and underscores, as in Aura. Documentation.

required is not specifically reserved, and aside from a small handful of restrictions, you can use any names you want. In Aura, you can specifically use any name that meets the rules without reservation. As far as I know, there's no restriction on even using HTML global attributes if you really want to, although I wouldn't recommend it.

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