Run results for: Getting a context: closest vs while loop vs event propagation

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Linux

Device Platform: Desktop

Date tested: 5 months ago

while loop + tagName check

2K/s

closest with element selector

2K/s

event propagation

98/s

View exact numbers

Test name	Executions per second
✓ while loop + tagName check	1,702 Ops/sec
closest with element selector	1,581 Ops/sec
event propagation	98 Ops/sec

HTML Preparation code:

<context-provider id="provider">
  <div>
    <div></div>
    <div>
      <span>
        <span>
          <span>abc</span>
        </span>
        def
        <span>
          <span id="foo"></span>
        </span>
      </span>
      ghi
    </div>
  </div>
</context-provider>

Script Preparation code:

var context = document.getElementById('provider');
var element = document.getElementById('foo');

var SimpleContextEvent = class SimpleContextEvent extends Event {
  data = null;
  
  constructor() {
    super('context-request', {bubbles: true, composed: true});
  }
};

context.addEventListener('context-request', event => {
  event.data = 'abc';
  event.stopPropagation();
});

Tests:

closest with element selector
var i = 5000; while (i--) { let ctx = element; ctx = ctx.closest('context-provider'); }
while loop + tagName check
var i = 5000; while (i--) { let ctx = element; while (ctx) { if (ctx.tagName === 'CONTEXT-PROVIDER') { break; } ctx = ctx.parentNode; } }
event propagation
var i = 5000; while (i--) { let ctxEvent = new SimpleContextEvent(); element.dispatchEvent(ctxEvent); }