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Replying to and
It looks like he's using a crappy theme. I just checked my sites & only 1 of the issues he mentioned exists. The extra blank lines on the source page. No issues with paragraph, header tags, or code comments at all on my sites. Using a good theme has always been important.
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Replying to and
He's the creator of Thesis, the OG theme framework before Genesis kinda blew him away. Thesis was known for kinda going against the grain of WP architecture and he has a history of beefing with them about it. So I assume he's using thesis himself. I switched a few years ago
Replying to and
Ahh makes sense... I use Genesis/Studiopress. Yea if the theme developers don't update with WordPress, it will always create issues. Similar to apps needing updates to function after iPhone/android updates... He's not wrong but he's definitely not revealing all the key info.