Html: Valid id attribute values?
In HTML, an id attribute should begin with a letter (A-Z/a-z) or an underscore (_). It can include letters, numbers, hyphens, underscores, colons, and periods. You must ensure that there is no whitespace present. Here's a correct example:
Avoid "bad practices" like this:
The value of unique IDs
Always remember: id values should be unique within a single HTML document. It's like people: everyone needs to have their own unique name to distinguish themselves. No duplicate names allowed - even twins need different names!
Dealing with special characters
Brace yourselves when using special characters like periods or colons in your id values. They might be perceived differently in CSS or JavaScript. It's akin to a spy using codenames - you need to escape them properly with a backslash in CSS (\#my.id for my.id) and a double backslash in jQuery ($("#my\\.id")).
The sensitive case of XHTML
Keep in mind that in XHTML, unlike HTML5, id values are case-sensitive. Just as we consider 'John' different from 'john', XHTML does the same with id values. Be cautious with these case surprises!
Compatibility matters: No leading digits
Are we still following HTML4 compatibility? Then let's not have our id start with a number. Preserving these good old standards is like respecting your elders - it ensures broad family (read: browser) support!
Making the right choice with ID Naming
Coding is all about clean practices. Follow a consistent id naming strategy to maintain sanity in large projects and aid communication with fellow devs. Remember: An organised desk is a happy desk!
Best practices for JS/CSS integration
When interacting with JS and CSS systems, specific id formatting is key. It's like courting: you need to give them the right signals (formatting). Avoid characters that carry specific semantics in these languages, like the hash symbol (#).
Organising your ID armory
An organised system smoothes out development and future refactoring for id attributes. It's like having a well-organized toolshed: you can find whatever you need instantly. Consider using methodologies like BEM (Block Element Modifier) for this purposе.
Case sensitivity in different landscapes
Though in HTML5, cases in id values are irrelevant, do be cautious with certain doctypes or XML applications that are case-sensitive. Cases really do matter here: #myId, #MYID, and #MyID would be seen as three different entities.
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