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What characters can I use in an identifier for an HTML element?
For example:
<SPAN id="section[5]" ...>
(Or rather, should I stick to certain characters to make sure the id works across all major browsers/JavaScript engine).
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You can't have the same id multiple times. Use class instead. Show activity on this post. COMPONENTS: if you write reusable component e.g. ) in your example then if you put two ore more components into one document then you will get INVALID html.
The id global attribute defines an identifier (ID) which must be unique in the whole document. Its purpose is to identify the element when linking (using a fragment identifier), scripting, or styling (with CSS).
An element can't have more than one ID and an ID can't be used more than once in a page.
If you have multiple elements with the same ID, you'll only run into problems when using JavaScript to access those elements. For example, if you were to do document. getElementById('duplicateId') , you would only get back one element instead of two. Other than that, the browser will render the page just fine.
In HTML5, the only restrictions are that the ID must be unique within the document, contain at least one character and contain no spaces. See http://www.w3.org/TR/2014/REC-html5-20141028/dom.html#the-id-attribute
As other answers have pointed out, HTML 4 is more restrictive and specifies that
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 (".").
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