Возникла необходимость при разрешении экрана шириной меньше 800, уменьшить размер видео.пробую так, не срабатывает почему-то.
<script type="text/javascript">
alert();
if(screen.width<=800)
{
document.write('
<div align="center">
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</div>');
} else
{
document.write('
<div align="center">
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}
</script>