Why can’t I have a numeric value as the ID of an element?

by

That’s just what the spec says.

From the HTML 4 specification:

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (“-“),
underscores (“_”), colons (“:”), and periods (“.”).

The good news is that the HTML 5 specification is more lenient:

The id attribute specifies its element’s unique identifier (ID).
The value must be unique amongst all the IDs in the element’s home
subtree and must contain at least one character. The value must not
contain any space characters.

More Related Contents:

  1. Is there a W3C valid way to disable autocomplete in a HTML form?
  2. Is it valid to have a html form inside another html form?
  3. Are iframes considered ‘bad practice’? [closed]
  4. input type=”submit” Vs button tag are they interchangeable? [duplicate]
  5. Do you quote HTML5 attributes? [closed]
  6. Is a DIV inside a TD a bad idea?
  7. Is an anchor tag without the href attribute safe?
  8. Create a HTML table where each TR is a FORM
  9. What is currently the best way to get a favicon to display in all browsers that support Favicons? [duplicate]
  10. Can I use non existing CSS classes?
  11. What is the standard naming convention for html/css ids and classes? [closed]
  12. Valid content-type for XML, HTML and XHTML documents
  13. What elements can a span tag contain in HTML5?
  14. Semantically, which is more correct: a in h2, or h2 in a?
  15. What characters are allowed in the HTML Name attribute inside input tag?
  16. HTML: Characters allowed for name attribute of input element?
  17. or (HTML5)
  18. Giving the script tag an ID
  19. Why would Google use a font tag?
  20. Block Level Elements inside Inline elements [duplicate]
  21. Need Complex Layout
  22. Render a string in HTML and preserve spaces and linebreaks
  23. JavaServer Faces 2.2 and HTML5 support, why is XHTML still being used
  24. Is it possible to get the HTML code from WebView
  25. Setting table column width
  26. How to make a sticky footer using flexbox in IE11?
  27. CSS position element “fixed” inside scrolling container
  28. Is it safe to use anchor to submit form?
  29. Is it possible to change the order of list items using CSS3?
  30. How to get the HTML source of a webpage in Ruby [duplicate]

Leave a Comment