This guide reframes web accessibility as a core pillar of strategic, high-quality web development, driven by a self-reinforcing tripartite imperative: legal compliance, commercial advantage, and ethical design.

No. While Google recommends we use W3C validation, Google doesn’t rank valid html and css pages above invalid pages. If Google can crawl and render a page Google will rank the page appropriately based on how relevant it is to the query. Invalid HTML can on the other hand can cause search engines problems.