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<script type="text/javascript">

    function understands_video() {
    return !!document.createElement(‘video’).canPlayType; // boolean
    }

    if ( !understands_video() ) {
    // Must be older browser or IE.
    // Maybe do something like hide custom
    // HTML5 controls. Or whatever…
    videoControls.style.display = ‘none’;
    }

  </script>