svg
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 56 56" role="img" aria-label="Brackets"><title>Brackets</title><desc>Four corner brackets light in turn, sweeping clockwise.</desc><defs><circle id="b" r="2.4" fill="#ffffff" opacity="0.07"/><circle id="l" r="3.1"/></defs><style>.l{fill:#ffffff;opacity:0;animation:icon-43-k 2000ms cubic-bezier(0.25, 1, 0.5, 1) infinite both;}@keyframes icon-43-k{0%{opacity:0;}8%{opacity:1;}36%{opacity:0.05;}100%{opacity:0;}}@media (prefers-reduced-motion:reduce){.l{animation:none;opacity:0.45;}}.d00,.d01,.d10{animation-delay:0ms;}.d03,.d04,.d14{animation-delay:500ms;}.d30,.d40,.d41{animation-delay:1500ms;}.d34,.d43,.d44{animation-delay:1000ms;}</style><use href="#b" x="6" y="6"/><use href="#b" x="17" y="6"/><use href="#b" x="28" y="6"/><use href="#b" x="39" y="6"/><use href="#b" x="50" y="6"/><use href="#b" x="6" y="17"/><use href="#b" x="17" y="17"/><use href="#b" x="28" y="17"/><use href="#b" x="39" y="17"/><use href="#b" x="50" y="17"/><use href="#b" x="6" y="28"/><use href="#b" x="17" y="28"/><use href="#b" x="28" y="28"/><use href="#b" x="39" y="28"/><use href="#b" x="50" y="28"/><use href="#b" x="6" y="39"/><use href="#b" x="17" y="39"/><use href="#b" x="28" y="39"/><use href="#b" x="39" y="39"/><use href="#b" x="50" y="39"/><use href="#b" x="6" y="50"/><use href="#b" x="17" y="50"/><use href="#b" x="28" y="50"/><use href="#b" x="39" y="50"/><use href="#b" x="50" y="50"/><use class="l d00" href="#l" x="6" y="6"/><use class="l d01" href="#l" x="17" y="6"/><use class="l d03" href="#l" x="39" y="6"/><use class="l d04" href="#l" x="50" y="6"/><use class="l d10" href="#l" x="6" y="17"/><use class="l d14" href="#l" x="50" y="17"/><use class="l d30" href="#l" x="6" y="39"/><use class="l d34" href="#l" x="50" y="39"/><use class="l d40" href="#l" x="6" y="50"/><use class="l d41" href="#l" x="17" y="50"/><use class="l d43" href="#l" x="39" y="50"/><use class="l d44" href="#l" x="50" y="50"/></svg>