I am using jQuery and I am just wondering, does ID have to be always unique in the whole page? Class, I know, can be repeated as many times as you like, what about ID?
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I am using jQuery and I am just wondering, does ID have to be always unique in the whole page? Class, I know, can be repeated as many times as you like, what about ID?
Yes, it must be unique.
HTML4:
https://www.w3.org/TR/html4/struct/global.html#h-7.5.2
Section 7.5.2:
HTML5:
https://www.w3.org/TR/html5/dom.html#element-attrdef-global-id