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I have just seen an old customer’s website which has now been revamped by someone else.
There is no inbound links and there is only one outbound link going out.
The site has not been validated, Ref: NO DOCTYPE FOUND! FALLING BACK TO HTML 4.01 TRANSITIONAL
There are only 18 words of content on the index page and Google has assigned a PR of 5 for the first page
So how does Google work the PR out if the links are missing and the site is not validated?
</head>, for example), then validating the file or adding a doctype won't make any difference for Googlebot. For the end users, that may be a different matter...
Having perfect code cannot harm you, and might even help you a little.
Do the best job you can on your code. Look at this Google search [google.com], these people have code that is harming them. They all have malformed <title> or </title> tags.
A page can have PR -- even before it is created -- if the inbound links exist in advance. All on-page details are totally irrelevant to PR.