Re: [dom] Added an example showing feature detection with supports() (#144)

> @@ -8705,6 +8705,25 @@ associated <a for="/">element</a>'s
>    <p>Throws a <code>TypeError</code> exception if the associated attribute has no supported tokens defined.
>  </dl>
>  
> +<p>The <a method for=DOMTokenList lt="supports()">supports()</a> method can be used to detect support for {{DOMTokenList}} tokens:
> +
> +<pre class=lang-javascript>
> +var DOMTokenListSupports = function(tokenList, token) {
> +    if (!tokenList || !tokenList.supports) {
> +        return false;

fair point. Will change

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