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Randomblue
Randomblue

Reputation: 116283

Which DOM elements cannot accept an id?

I'm reading this basic tutorial on canvas elements. The (almost) in the following sentence caught my eye:

The id attribute isn't specific to the element but is one of the default HTML attributes which can be applied to (almost) every HTML element

Which html elements cannot accept an id?

Upvotes: 14

Views: 285

Answers (3)

animuson
animuson

Reputation: 54729

In HTML5, the id attribute is a global attribute and can be specified on any element.

If you look through the Document Type Declaration for HTML4, you can find the elements which do not have %attrs; defined in their attribute list to indicate they do not support the id attribute. Those included are near the bottom in the "Document Head" section: HEAD, TITLE, BASE, META, STYLE, SCRIPT, and HTML.

Note that although the PARAM element does not include the %attrs; declaration in its attribute list, it does explicitly allow the id attribute itself in that list.

<!ATTLIST PARAM
  id          ID             #IMPLIED  -- document-wide unique id --
  name        CDATA          #REQUIRED -- property name --
  value       CDATA          #IMPLIED  -- property value --
  valuetype   (DATA|REF|OBJECT) DATA   -- How to interpret value --
  type        %ContentType;  #IMPLIED  -- content type for value
                                      when valuetype=ref --
  >

Upvotes: 13

Denys S&#233;guret
Denys S&#233;guret

Reputation: 382150

From w3schools (yes, I know...) :

Note: The id attribute is not valid in: <base>, <head>, <html>, <meta>, <param>, <script>, <style>, and <title>.

Note that this is only valid for HTML4 but that explains the "almost" of the tutorial.

As others have pointed out, HTML5 accepts id on all elements.

Upvotes: 14

Jukka K. Korpela
Jukka K. Korpela

Reputation: 201588

It’s a bit surprising that they say this in the context of the canvas element, which is an HTML5 element. In HTML5, the id attribute is allowed for any element without exception. Earlier versions of HTML impose various limitations. HTML 4.01 excludes base, head, html, meta, script, style, and title, but XHTML 1.01 removes this restriction.

Upvotes: 3

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