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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 do the following I get SyntaxError: DOM Exception 12 in the console.
document.querySelector("#1")
I'm just curious why using numbers as IDs does not work querySelector when the HTML5 spec says these are valid. I tried multiple browsers.
546
From what I understand the HTML5 spec lets you use IDs that are numbers like this. I can access these fine using getElementById but not with querySelector .
Use the querySelectorAll() method to select elements by multiple ids, e.g. document. querySelectorAll('#box1, #box2, #box3') . The method takes a string containing one or more selectors as a parameter and returns a collection of the matching elements.
querySelector() method to get an element by id by partially matching a string, e.g. const el = document. querySelector('[id*="my-partial-id"]') . The method returns the first element within the document that matches the provided selector. Here is the HTML for the examples in this article.
It is valid, but requires some special handling. From here: http://mathiasbynens.be/notes/css-escapes
Leading digits
If the first character of an identifier is numeric, you’ll need to escape it based on its Unicode code point. For example, the code point for the character 1 is U+0031, so you would escape it as \000031 or \31 .
Basically, to escape any numeric character, just prefix it with \3 and append a space character ( ). Yay Unicode!
So your code would end up as (CSS first, JS second):
#\31 {
background: hotpink;
}
document.getElementById('1');
document.querySelector('#\\31 ');
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