Pseudo classes.
Blur, hue-rotate, opacity, brightness, contrast, saturate, drop-shadow, grascale, invert, and sepia.
Flexboxes have adaptable options to dynamically adjust the alignment and dispersal of items in a container.
Hex, RGB(A), and HSL(A).
Name, delay, direction, duration, fill-mode, iteration-count, play-state, and timing-funciton.
<textarea> or
<input type="[text, number, password]">.
Using position:absolute and setting the top: and left: values to extremes, or using display:none.
<table>, <tr>, and <td>.