ed>button</button>
<button hidden>button</button>
<a>a</a>
<a href="#">a</a>
<svg><a>svg a</a></svg>
<svg><a>svg a</a></svg>
<link id="nohref">
<textarea></textarea>
<select><optgroup><option>option</option></optgroup></select>
<select multiple></select>
<iframe width="10" height="10"></iframe>
<embed width="10" height="10"></embed>
<object width="10" height="10"></object>
<span></span>
<div></div>
<details><summary>summary</summary><summary id="secondsummary">second summary</summary>details</details>
<div 