Ok, so here is variation that contains zero JS and (ab)uses the "invisible_anchor:focus + sibling_anchor_pointing_to_previous_anchor" trick [0]. I'd prefer th

Ok, so here is variation that contains zero JS and (ab)uses the "invisible_anchor:focus + sibling_anchor_pointing_to_previous_anchor" trick [0]. I'd prefer the original version, though. This is more or less a hack. [0] https://myfonj.github.io/sandbox.html#%3C!doctype%20html%3E%3Chtml%20lang%3D%22en%22%3E%3Ctitle%3Ehalf%20minute%20focus%3C%2Ftitle%3E%0A%3Cmeta%20name%3D%22color-scheme%22%20content%3D%22dark%20light%22%3E%0A%3Cmeta%20name%3D%22viewport%22%20content%3D%22width%3Ddevice-width%2C%20initial-scale%3D1%22%3E%0A%3Cstyle%3E%0Ahtml%20%7B%0A%20--limit-seconds%3A%2030%3B%0A%20--in-out-seconds%3A%205%3B%0A%20--cycles-count%3A%20calc(var(--limit-seconds)%20%2F%20var(--in-out-seconds)%20*%202)%3B%0A%20--duration-seconds%3A%20calc(.5s%20*%20var(--in-out-seconds))%3B%0A%20min-height%3A%20100vh%3B%0A%20display%3A%20grid%3B%0A%20place-items%3A%20center%3B%0A%7D%0A%23go%20%7B%20%0A%20opacity%3A%200%3B%0A%20%26%20%2B%20a%20%7B%0A%20%20animation-direction%3A%20alternate%3B%0A%20%20animation-timing-function%3A%20cubic-bezier(.7%2C%200%2C%20.3%2C%201)%3B%0A%20%20animation-duration%3A%20var(--duration-seconds)%3B%0A%20%20animation-iteration-count%3A%20var(--cycles-count)%3B%0A%20%20animation-fill-mode%3A%20none%3B%0A%20%20width%3A%2040vmin%3B%0A%20%20height%3A%2040vmin%3B%0A%20%20background-color%3A%20canvastext%3B%0A%20%20color%3A%20canvas%3B%0A%20%20border%3A%20none%3B%0A%20%20border-radius%3A%2050%25%2050%25%3B%0A%20%20display%3A%20grid%3B%0A%20%20align-items%3A%20center%3B%0A%20%20justify-content%3A%20center%3B%0A%20%20text-decoration%3A%20none%3B%0A%20%7D%0A%20%26%3Afocus%20%2B%20a%20%7B%0A%20%20animation-name%3A%20run%3B%0A%20%7D%0A%7D%0A%40keyframes%20run%20%7B%0A%20from%20%7B%0A%20%20color%3A%20canvastext%3B%0A%20%20transform%3A%20scale(1)%3B%0A%20%20opacity%3A%20.5%3B%0A%20%20filter%3A%20blur(1vmin)%3B%0A%20%7D%0A%20to%20%7B%0A%20%20color%3A%20canvastext%3B%0A%20%20transform%3A%20scale(2)%3B%0A%20%20opacity%3A%20.9%3B%0A%20%20filter%3A%20blur(.1vmin)%3B%0A%20%7D%0A%7D%0A%3C%2Fstyle%3E%0A%3Ca%20href%3D%22%23%22%20id%3D%22go%22%20tabindex%3D%22-1%22%3E%3C%2Fa%3E%0A%3Ca%20href%3D%22%23go%22%3EClick%20to%20animate.%3C%2Fa%3E https://myfonj.github.io/sandbox.html#%3C!doctype%20html%3E%...