required attribute do in a form input?<canvas> element require to draw graphics?placeholder attribute do in an input element?<abbr> element?<summary> element do in conjunction with <details>?accesskey attribute?action attribute in a <form> specify?<script defer> attribute do?method attribute in a <form> specify?<cite> element represent?
srcset attribute do in an <img> tag?<mark> element represent?target="_blank" attribute in a link?<address> element represent?<abbr title="..."> element do?<noscript> tag?contenteditable attribute do?onload event attribute do in HTML?<embed> element?min attribute do in an <input> element?<progress> element represent?<footer> element?autocomplete attribute do in a form?<time> element?<object> element?