[5.x]: HTML IDs should be allowed to begin with a number

[MoritzLost]

[5.x]: HTML IDs should be allowed to begin with a number

[brandonkelly]

Doh, you’re right. Not sure how I missed that I was looking at the HTML4 spec.

Fixed for the next release.

[AugustMiller]

Just a heads up that while HTML5 allows numerals at the beginning of id attributes, CSS identifiers do not:

{% set id = '123-custom-string' | id %}

<div id="{{ id }}">Hello, world!</div>

{% css %}
  /* This block won't be applied to our div: */
  #{{ id }} {
    color: red;
  }
{% endcss %}

[brandonkelly]

Craft 5.1.8 is out with that fix.

[MoritzLost]

@brandonkelly Thanks Brandon!