What are legal characters for an HTML element id?
This question already has an answer here:
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 (".").
In HTML 4, the id attribute holds a NAME token which are defined:
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 (".").
As pointed out in a previous post, depending on your implementation you may have troubles with colons and periods along with others: What are valid values for the id attribute in HTML?
From http://www.w3.org/TR/html4/types.html:
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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