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Best Way to Clean Up Web Code

Hello. I have a couple of websites that I have written over the years with much help from this site. They all work well but that is not to say they are done "right." As I try to dig myself out of the impact of COVID, I want to go through them (total of three) and make sure they are written cleanly. Are there utilities that could be effectively used by a self-taught web hack that could point out issues in lay-out and standards adherence on a page-by-page basis? The pages are classic asp, which I am fine with, but also css, bootstrap, jquery/json/ajax, and html4.

Thanks in advance!

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Dave Baldwin

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leakim971

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Bob Schneider

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I have started doing that and I am running in to some issues that were created by Mobirise...a third party utiity that I used to piece together the basic design. Should I avoid those? Are they bad for SEO or rendering in different screens sizes/browers? Here is an example:
Error: Attribute once not allowed on element section at this point.
From line 36, column 3; to line 36, column 64
↩<body>↩ <section class="menu cid-qzXzsb3BT2" once="menu" id="menu1-q">↩↩

Dave Baldwin

Things like once="menu" are often used by javascript on your website. They get marked as errors because they are not 'official' attributes.

Bob Schneider

ASKER

Thank you!