I'd also mention using inline event listeners (JS) and using numbered IDs (or even worse, numbered classes), instead of just a single class on multiple elements (I mean, #tab1, #tab2 and #tab3 instead of just making each have a class .tab).
This second one is more common in case of beginners, while the first is present almost everywhere!
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I'd also mention using inline event listeners (JS) and using numbered IDs (or even worse, numbered classes), instead of just a single class on multiple elements (I mean,
#tab1,#tab2and#tab3instead of just making each have a class.tab).This second one is more common in case of beginners, while the first is present almost everywhere!