Feature 1: The ":has()" selector

Allows the styling of an specific elements, that contain a specific child element.
For an example:

section:has(h2) {
background: lightgray;
}

Feature 2: New Color Functions

Allow for more customized coloring of elements.
These include:

hwb(): Hue, Whiteness, Blackness.
lab(): Lightness, along with a and b values, which determine the hue.
lch(): Lightness, Chroma, Hue.
color-mix(): Mix two colors together.
color-contrast(): From a list of colors, output the one with the highest contrast compared to the first argument.
color(): Specify a color in a different color space (e.g.display-p3).