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classes, IDs etc
So far classes and IDs seem to be getting used for almost everything, is this common? or would this in turn slow down the performance when a site increases in size?
Austin Whipple29,725 Points
I think you'd have to add a ridiculous number of IDs and classes to increase the data size enough to slow down a site. HTML is pretty lightweight overall, so normal usage of IDs and classes (even adding a few classes to most elements on a page) shouldn't negatively impact performance.
Some important things of note here: First, HTML 5 has added a lot of semantic elements such as
article, etc., so some need for class names has been reduced (using
header instead of
<div class="header"> for instance). Second, IDs should be unique on the page and are often reserved for functionality more than design. If you have multiple elements on a single page with the same ID, your HTML is no longer valid.