Re: [dom] DOMTokenList hook to validate added token is in a supported set of keywords (#103)

> @@ -8679,6 +8679,18 @@ interface DOMTokenList {
>  <p>A {{DOMTokenList}} object also has an associated <a for="/">element</a> and an <a>attribute</a>'s
>  <a for=Attr>local name</a>.
>  
> +<a lt="Other applicable specifications">Specifications</a> may define
> +<dfn export for=Node id=concept-supported-keywords>supported keywords</dfn> for a {{DOMTokenList}}'s associated attribute.
> +
> +<p>A {{DOMTokenList}} object's
> +<dfn export id=concept-domtokenlist-validation for="DOMString">validation steps</dfn> for a given <var>token</var> are:
> +<ol>

will add

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