html5 - Is legend in header valid ? <h1><legend> Caption </legend></h1> -

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i know if insert legend inside header. way legend can have hierarchy related whole document.

i have more text below relevant needs highlighted readers. in case personal information legend , h2 @ same time. h1 element in site chose not display.

<fieldset>     <h2>      <legend>personal information</legend>    </h2>     <h3>      credentials    </h3>    <label for="username">       username    </label>    <input id="username" type="text">   <label for="surname">       surname   </label>   <input id="surname" type="text">    <h3>      contact details    </h3>    <label for="street">       street    </label>    <input id="street" type="text">   <label for="house-number">       house number   </label>   <input id="house-number" type="number">  </fieldset>

as stated in https://developer.mozilla.org/it/docs/web/html/element/legend

permitted parent elements: <fieldset> first child <legend> element

in example <legend> element not first child of ancestor <fieldset>, not valid html5 markup.

furthermore note reverting order of elements so

<legend><h2>personal information</h2></legend>

the markup not still valid, since <legend> allows phrasing content only


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