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Tested some HTML5-new attributes for form controls. On <textarea> @inputmode is correctly flagged as "not allowed on HTML element input", as it has apparently been removed from official spec, but it is still present in the available attributes, generating confusion.
After several months this small bug is still present. @inputmode is flagged as "not allowed" both in <input> and in <textarea>. But in the latter, it is also listed among the allowed attributes. Now everything depends on the normative source. If it is HTML5 CR, then the attribute is invalid and it's right not to show it as allowed. Otherwise if you validate against HTML5.1 WD or the nightly editor's draft, then it's valid in both elements and must not be flagged. Everything is accepted but the actual situation is confusing. Attribute inputmode not allowed on element textarea at this point. <body>↩<p><textarea inputmode="latin"></text Attributes for element textarea: Global attributes autocomplete autofocus cols dirname disabled *inputmode* maxlength name placeholder readonly required rows wrap