MeasureThat.net

Run results for: CSS Variable swaps - style.setProperty vs style.cssText vs style vs Object.assign vs setAttribute vs classList

Go to the benchmark
Run details:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Mobile Safari/537.36
Chrome Mobile 130
Android
Mobile
5 months ago
Test name Executions per second
style.setProperty 125.0 Ops/sec
style.cssText 109.2 Ops/sec
style 88.7 Ops/sec
Object.assign 434.8 Ops/sec
setAttribute 554.2 Ops/sec
classList 381.1 Ops/sec
HTML Preparation code:
​x
 
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<style>
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  :root {
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    --test-color: 'red';
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  }
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  .test {
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    color: var(--test-color);
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  }
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  .test-blue {
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    --test-color: 'blue';
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  }
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</style>
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​
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<div id="test"></div>
Script Preparation code:
 
el = document.getElementById("test");
Tests:

  • style.setProperty

     
    let i = 0;
    ​
    while (i < 10000) {
      el.style.setProperty("--test-color","blue");
      i++;
    }

  • style.cssText

     
    let i = 0;
    ​
    while (i < 10000) {
      el.style.cssText = "--test-color:blue;";
      i++;
    }

  • style

     
    let i = 0;
    ​
    while (i < 10000) {
      el.style = "--test-color:blue;";
      i++;
    }

  • Object.assign

     
    let style = {
      "--test-color": 'blue'
    };
    let i = 0;
    ​
    while (i < 10000) {
      Object.assign(el.style, style);
      i++;
    }

  • setAttribute

     
    let i = 0;
    ​
    while (i < 10000) {
      el.setAttribute('style',"--test-color:blue;");
      i++;
    }

  • classList

     
    let i = 0;
    ​
    while (i < 10000) {
      el.classList.add('test-blue');
      i++;
    }