HTML ID with numerical value not recognized by CSS

Question

Here is the div:

I got 9 of them with different positions on page so in the .css file I d

Answer 1

Although it's allowed to set a class or id to begin with a digit in HTML5, but it's not allowed in CSS, see the spec:

HTML5: 3.2.5.1 The id attribute

... There are no other restrictions on what form an ID can take; in particular, IDs can consist of just digits, start with a digit, start with an underscore, consist of just punctuation, etc. ...

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CSS: 4.1.3 Characters and case

... they cannot start with a digit, two hyphens, or a hyphen followed by a digit. Identifiers can also contain escaped characters and any ISO 10646 character as a numeric code ...

i.e.

is valid HTML, but you cannot target it with #1 {...} in CSS.

However, you can use [id="1"] {...} or escape it #\31 {...}

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