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chromium/third_party/blink/web_tests/virtual/gpu/fast/canvas/CanvasFillTextWithMinimalSize.html 

<!DOCTYPE html>
<title>Test when fillText doesn't respect browser minimal font size.</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<meta name=fuzzy content="maxDifference=0-1;totalPixels=0-3">
<style>
</style>

<canvas id="target" width="300" height="300"></canvas>
<script>
  if (window.testRunner) {
    testRunner.overridePreference('WebKitMinimumFontSize', '12');
    testRunner.waitUntilDone();
  }
  var target = document.getElementById("target");
  var targetCtx = target.getContext("2d");

  function drawTextTo(elem) {
    var ctx = elem.getContext("2d");
    ctx.fillStyle = "black";
    ctx.font = "8px Arial";
    ctx.fillText("Hello", 10, 10);
  }

  // Case A: Text rendered directly to target
  // Result A: 8px font size respected
  drawTextTo(target);

  // Case B: Text rendered to canvas element outside DOM
  // Result B: 8px font size respected
  var offscreen = document.createElement("canvas");
  drawTextTo(offscreen);
  targetCtx.drawImage(offscreen, 0, 20);

  // Case C: Text rendered to OffscreenCanvas element
  // Result C: 8px font size respected
  var offscreen2 = new OffscreenCanvas(100, 100);
  drawTextTo(offscreen2);
  targetCtx.drawImage(offscreen2, 0, 40);

  if (window.testRunner)
      testRunner.notifyDone();
</script>