: Providing that the HTML 4.01 implementation is properly marked up (i.e. tags are being used correctly and there are no horribly-broken links) and the HTML 5 implementation is similarly syntactically

@XinRu657

Providing that the HTML 4.01 implementation is properly marked up (i.e. tags are being used correctly and there are no horribly-broken links) and the HTML 5 implementation is similarly syntactically valid, you won't see any ranking changes based upon the change in markup - both versions could be considered "optimized" as-is.

If the HTML 4.01 implementation is a mess (not using heading tags, malformed links, design relies upon heavy use of <table>) you can expect to see modest improvements in ranking for long-tail phrases and quicker page rendering by fixing the markup (either in HTML 4.01 or HTML 5) but, for highly-competitive phrases, on-page optimization has far less impact on ranking than a page's inbound links.

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