How to create a sliding panel using HTML? I can't seem to find anything in the official documentation.
You can use jQuery UI Slider
(Another javascript question that jQuery answers)
HTML5 has slider support :
<input type="range" min="0" max="10" step="2" value="6">
... , type = "range" . , Safari, Chrome Opera . ( , iPhone . .) type = "text", , . (diveintohtml5.ep.io)