Is it possible to change a CSS pseudo-element style via JavaScript?  For example, I want to dynamically set the color of the scrollbar like so:  document.querySelector("#editor::-webkit-scrollbar-thumb:vertical").style.background = localSto...
From what I understand the HTML5 spec lets you use IDs that are numbers like this.  <div id="1"></div> <div id="2"></div>   I can access these fine using getElementById but not with querySelector.  If I try d...
A few months ago this article pointed out that classes could actually be avoided all together from website development.   My question is, how efficient are the data selectors compared to class selectors?   A simple example would be to compare queryin...
HTML  <body> <div class="lol"> <a class="rightArrow" href="javascriptVoid:(0);" title"Next image"> </div> </body>   Pseudo Code  $(".rightArrow").click(function() { rightArrowParen...
I'm currently using this to get the class for a specific bit of HTML on the page:  $(this).parent("div").attr('class')   But that div has multiple classes: current_status status_billed  My end goal here is to grab the class that s...
How can a set of CSS selectors be sorted on the basis of CSS specificity in a JS function?  function SortByCssSpecificity(input_array_of_css_selectors) {   ...   return sorted_array_of_css_selectors; }...
I know there is an extension called Dust-Me Selectors for Firefox and also that it doesn't look at dynamic HTML generated by JavaScript.  I'm looking for tool(s) that can identify all unused selectors from a stylesheet, attached to several pa...
What is fastest in jquery/javascript?  $('#myID .myClass')   or  $('.myClass')   What is best to use in CSS?  #myID .myClass{}   or  .myClass{}   I see now that I should have explained better. Sorry!  Ofceauce ID is a faster selector...
XPath can do everything querySelector can do, and more, so when would you ever choose the latter? I haven't seen any speed benchmarks comparing the two, so right now I'm choosing based on syntax conciseness, which seems kind of arbitrary.  Ed...

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