<i>&quot;Those aren&#x27;t cross-platform the way the web is cross-platform, they all depend primarily on one vendor&#x27;s implementation&quot;</i><p>And web browsers are different how, exactly?<p>(Other than the fact that &quot;the web&quot; is a mish-mash of hundreds of different &quot;standards&quot; with varying levels of mutual compatibility and standardization, of course.)