html - How to select an element that has an ID which begins with a digit?

Question

<div id="634670717473476800" align="center" style="width: 100%; overflow-y: hidden;" class="wcustomhtml">

I have the above HTML (autogenerated, cannot change) and I try to select the entire DIV in CSS. There are several "wcustomhtml" on the page so the ID is my only choice. Straightforward I would think.

But I am not able to select it, and I don't understand why.

Neither #634670717473476800 nor div#634670717473476800 manages to select the div. Can one not select an ID consisting of numbers only?

So if it is valid HTML, what can be wrong? Neither Chrome's inspect element nor Firebug lets me create rules based on the ID in the inspector.

Answer 1

You can access it by using an attribute selector and selecting the ID attribute:

[id='634670717473476800'] {
  background-color: red;
}

<div id="634670717473476800" align="center" style="width: 100%; overflow-y: hidden;" class="wcustomhtml">div</div>