Highlight pointer-events property
https://developer.mozilla.org/en-US/docs/Web/CSS/pointer-events
Highlight animation* properties
https://developer.mozilla.org/en-US/docs/Web/CSS/animation
Highlight border-image* properties
https://developer.mozilla.org/en-US/docs/Web/CSS/border-image
Highlight flex* properties
https://developer.mozilla.org/en-US/docs/Web/CSS/flex
Highlight @keyframes at-rule
https://developer.mozilla.org/en-US/docs/Web/CSS/@keyframes
Highlight *gradient() functions
https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient
Highlight some Selectors Level 4 pseudo-classes
https://developer.mozilla.org/en-US/docs/Web/CSS/:fullscreen
https://developer.mozilla.org/en-US/docs/Web/CSS/:in-range
https://developer.mozilla.org/en-US/docs/Web/CSS/:out-of-range
https://developer.mozilla.org/en-US/docs/Web/CSS/:scope