How much time should I put into validating my HTML and CSS?

wajones

New Member
I'm making some pages using HTML, CSS, JavaScript and PHP. How much time should I be putting into validating my pages using W3C's tools? It seems everything I do works but provides more errors according to the validations.Am I wasting my time using them? If so any other suggestions to make sure I am making valid pages or if it works it's fine?
 
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