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diff --git a/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.wordSpacing.measure.html b/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.wordSpacing.measure.html
new file mode 100644
index 0000000000..7a1d867d0f
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.wordSpacing.measure.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.text.drawing.style.wordSpacing.measure</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.text.drawing.style.wordSpacing.measure</h1>
+<p class="desc">Testing word spacing with different length units</p>
+
+
+<script>
+var t = async_test("Testing word spacing with different length units");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(100, 50);
+  var ctx = canvas.getContext('2d');
+
+  _assertSame(ctx.letterSpacing, '0px', "ctx.letterSpacing", "'0px'");
+  _assertSame(ctx.wordSpacing, '0px', "ctx.wordSpacing", "'0px'");
+  var width_normal = ctx.measureText('Hello World, again').width;
+
+  function test_word_spacing(value, difference_spacing, epsilon) {
+    ctx.wordSpacing = value;
+    _assertSame(ctx.letterSpacing, '0px', "ctx.letterSpacing", "'0px'");
+    _assertSame(ctx.wordSpacing, value, "ctx.wordSpacing", "value");
+    width_with_word_spacing = ctx.measureText('Hello World, again').width;
+    assert_approx_equals(width_with_word_spacing, width_normal + difference_spacing, epsilon, "word spacing doesn't work.");
+  }
+
+  // The first value is the word Spacing to be set, the second value the
+  // change in length of string 'Hello World', note that there are 2 words
+  // in 'Hello World, again', so the length difference is always wordSpacing * 2.
+  // and the third value is the acceptable differencee for the length change,
+  // note that unit such as 1cm/1mm doesn't map to an exact pixel value.
+  test_cases = [['3px', 6, 0.1],
+               ['5px', 10, 0.1],
+               ['-2px', -4, 0.1],
+               ['1em', 20, 0.1],
+               ['-0.5em', -10, 0.1],
+               ['1in', 192, 0.1],
+               ['-0.1cm', -7.57, 0.2],
+               ['-0.6mm', -4.54, 0.2]]
+
+  for (const test_case of test_cases) {
+    test_word_spacing(test_case[0], test_case[1], test_case[2]);
+  }
+  t.done();
+
+});
+</script>