You got me, I actually searched for evidence that the <blink> element supported a `speed` attribute. The MDN page about <blink> has example CSS to make the ele

You got me, I actually searched for evidence that the <blink> element supported a `speed` attribute. The MDN page about <blink> has example CSS to make the element blink again. If you wanted to make speed variants, you could use CSS selectors that set different durations based on a data attribute and its value: blink { animation: 2s linear infinite condemned_blink_effect; } blink[data-speed: fast] { animation-duration: 1s } blink[data-speed: slow] { animation-duration: 4s }