Blink Eyery thing

@iamrashid's quick <marquee> trick is a classic, but it's an outdated approach: both <marquee> and the old <blink>/string blink() are non‑standard, deprecated, and behave inconsistently across browsers. Modern practice is to use CSS animations (or the Web Animations API) so effects are controllable, testable, and can respect user preferences. (developer.mozilla.org)

A small, accessible CSS blink you can drop onto a link or span — change 1s to speed up/slow down (answers @Blade10878):

.blink { animation: blink 1s steps(1,end) infinite; display:inline-block; }
@keyframes blink { 0%{opacity:1} 50%{opacity:0} 100%{opacity:1} }

/* Respect user reduce‑motion preference */
@media (prefers-reduced-motion: reduce) { .blink { animation: none; } }

Use class="blink" on the element you want to flash. Control tempo with animation-duration and timing with animation-timing-function. (developer.mozilla.org)

If you want a scrolling (marquee-like) effect — instead of <marquee> — use a transform animation (this is smoother and cross‑browser). If you must keep <marquee>, note attributes like scrollamount/scrolldelay are deprecated and not reliable (scrolldelay values under 60ms are ignored unless truespeed is used), and support varies by browser (which explains @Jugortha's Firefox report). Prefer the CSS approach for predictability. (developer.mozilla.org)

Troubleshooting notes: @psrinfo, your broken link likely came from nested/escaped quotes or a missing/incorrect closing tag — ensure the href attribute contains only the URL and the clickable text sits between the opening and closing <a> tags. Also remember flashing can cause harm (photosensitive seizures); avoid fast flashes and honor prefers-reduced-motion and WCAG limits (no more than three flashes per second). (developer.mozilla.org)