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

> +var DOMTokenListSupports = function(tokenList, token) {
> +      if (!tokenList || !tokenList.supports) {
> +          return false;
> +      }
> +      try {
> +          return tokenList.supports(token);
> +      } catch (e) {
> +          if (e instanceof TypeError) {
> +            console.log("The DOMTokenList doesn't have a supported tokens list");
> +          } else {
> +            console.error("That shouldn't have happened");
> +          }
> +      }
> +};
> +
> +var linkSupportsPreload = tokenListSupports(document.createElement("link").relList, "preload"); // true

Perhaps it's better to leave the actual token here as a variable.

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