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  Drag the following link to your Bookmarks bar to create a bookmarklet to change your cursor to 24×24 pixels square for testing the proposed WCAG 2.2 Target Size requirement (ref: <a href="" target="_top">Understanding Success Criterion 2.5.8: Target Size (Minimum)</a>).
  <a href="javascript:(function(){var d=document,id='AAR24pxBkmklt',el=d.getElementById(id),f=d.querySelectorAll('iframe'),i=0,l=f.length;if(el){function removeFromShadows(root){for(var el of root.querySelectorAll('*')){if(el.shadowRoot){el.shadowRoot.getElementById(id).remove();removeFromShadows(el.shadowRoot);}}}el.remove();if(l){for(i=0;i<l;i++){try{f[i].contentWindow.document.getElementById(id).remove();removeFromShadows(f[i].contentWindow.document);}catch(e){console.log(e)}}}removeFromShadows(d);}else{s=d.createElement('style');;s.appendChild(d.createTextNode(%27*{ cursor: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYAgMAAACdGdVrAAAACVBMVEUAAAAAAAD///+D3c/SAAAAAXRSTlMAQObYZgAAACtJREFUCNdjCAUDhqxVQLCSIYEBCDgJUIwOOCnG0FAHKIVfJWGLoE6COhAAxmsXhSV+DZoAAAAASUVORK5CYII=) 12 12, auto !important}%27));function applyToShadows(root){for(var el of root.querySelectorAll('*')){if(el.shadowRoot){el.shadowRoot.appendChild(s.cloneNode(true));applyToShadows(el.shadowRoot);}}}d.getElementsByTagName('head')[0].appendChild(s);for(i=0;i<l;i++){try{f[i].contentWindow.document.getElementsByTagName('head')[0].appendChild(s.cloneNode(true));applyToShadows(f[i].contentWindow.document);}catch(e){console.log(e)}}applyToShadows(d);}})();">24×24 Cursor</a>
  Note that the new SC is still in flux and may not even be a square when done. Follow the <a href="" target="_top">GitHub discussions</a> for updates.
  This is a fork and improvement of my <a href="" target="_top">44×44 bookmarklet</a> (which was based on Jared Smith's <a href="" target="_top">44x44 bookmark</a>). To remove the cursor, activate the bookmarklet again. Thanks to Pat for the suggestion to adapt his own <a href="" target="_top">focus outline bookmarklet</a> (adapted from Steve's <a href="" target="_top">text spacing bookmarklet</a> from work by Pat and Jon Gibbins) which allows it to toggle on and off and to work in one level of nested iframes, such as this empty one:
  Note your browser's Content Security Policy may prevent the script from modifying a page, in which case you can run it in the browser console. In Firefox use <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>K</kbd>, In Chrome use <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>J</kbd>.


                body {
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  line-height: 1.4;
  /*   line-height: 1.5; */
  /*   letter-spacing: 0.12em; */
  /*   word-spacing: 0.16em; */

iframe {
  width: 90vw;
  height: 4em;


                // document.onkeydown = function(evt) {
//   evt = evt || window.event;
//   var isEscape = false;
//   if ("key" in evt) {
//     isEscape = evt.key == "Escape" || evt.key == "Esc";
//   } else {
//     isEscape = evt.keyCode == 27;
//   }
//   if (isEscape) {
//     var a=document.createElement('style'),b;
//     document.head.appendChild(a);
//     b=a.sheet;
//     b.insertRule('*{cursor:revert !important}',0);
//   }
// };

// document.onkeydown=function(e){var n;("key"in(e=e||window.event)?"Escape"==e.key||"Esc"==e.key:27==e.keyCode)&&(n=document.createElement("style"),document.head.appendChild(n),n.sheet.insertRule("*{cursor:revert !important}",0))};