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Continue to ChatHTML's element attributes – do they need quotes? https://wp.jochen.hayek.name/blog-en/2016/08/16/htmls-element-attributes-do-they-need-quotes/
HTML's element attributes – do they need quotes? https://wp.jochen.hayek.name/blog-en/2016/08/16/htmls-element-attributes-do-they-need-quotes/