The Spellcheck attribute can be used on editable elements to indicate the browser can spell checking can be performed
The capture attribute hints the browser that for a file input, we allow user to provide image/audio directly from the camera or microphone
The contenteditable attribute allows the user to edit any element, including paragraphs, divs and so on
Input type color display a color picker widget
theme-color meta element can be used to style the tab color in mobile browsers
<optiongroup> element can be used to group options inside a <select> element