Display one of 3 icons (valid, warning(s), error(s)) in navigation bar related to validity of (x)HTML document currently shown. Errors/warnings can be displayed as page popup or with every details returned from w3c in a new tab.
www.chromeextensions.orgIn Firefox, there's a Extension called “Html Validator”. It adds a little indicator icon at the bottom right corner of your window. When a page you visit isn't valid, it lights up. You can click on it to see the errors.
stackoverflow.comwww.htmlvalidator.com
qaru.site
www.ilovefreesoftware.com
robertnyman.com
chrome.google.com
pluginsaddonsextensions.com
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