diff --git a/html/canvas/element/fill-and-stroke-styles/2d.gradient.conic.html b/html/canvas/element/fill-and-stroke-styles/2d.gradient.conic.html
new file mode 100644
index 00000000000000..608b6a14db1bf4
--- /dev/null
+++ b/html/canvas/element/fill-and-stroke-styles/2d.gradient.conic.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>Canvas test: 2d.gradient.conic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
+<body class="show_output">
+
+<h1>2d.gradient.conic</h1>
+<p class="desc">Conic gradient function exists</p>
+
+
+<p class="output">Actual output:</p>
+<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
+<p class="output expectedtext">Expected output:<p><img src="/images/green-100x50.png" class="output expected" id="expected" alt="">
+<ul id="d"></ul>
+<script>
+var t = async_test("Conic gradient function exists");
+_addTest(function(canvas, ctx) {
+
+const g = ctx.createConicGradient(0, 0, 25);
+g.addColorStop(0, "#0f0");
+g.addColorStop(0.5, "#0f0");
+g.addColorStop(0.51, "#f00");
+g.addColorStop(1, "#f00");
+ctx.fillStyle = g;
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(canvas, 25,25, 0,255,0,255, "25,25", "0,255,0,255");
+_assertPixel(canvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
+_assertPixel(canvas, 75,25, 0,255,0,255, "75,25", "0,255,0,255");
+
+
+});
+</script>
+
diff --git a/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.html b/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.html
new file mode 100644
index 00000000000000..a1a4651ef65bb9
--- /dev/null
+++ b/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
+<title>OffscreenCanvas test: 2d.gradient.conic</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/html/canvas/resources/canvas-tests.js"></script>
+
+<h1>2d.gradient.conic</h1>
+<p class="desc">Conic gradient function exists</p>
+
+
+<script>
+var t = async_test("Conic gradient function exists");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+var offscreenCanvas = new OffscreenCanvas(100, 50);
+var ctx = offscreenCanvas.getContext('2d');
+
+const g = ctx.createConicGradient(0, 0, 25);
+g.addColorStop(0, "#0f0");
+g.addColorStop(0.5, "#0f0");
+g.addColorStop(0.5, "#f00");
+g.addColorStop(1, "#f00");
+ctx.fillStyle = g;
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(offscreenCanvas, 25,25, 0,255,0,255, "25,25", "0,255,0,255");
+_assertPixel(offscreenCanvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
+_assertPixel(offscreenCanvas, 75,25, 0,255,0,255, "75,25", "0,255,0,255");
+t.done();
+
+});
+</script>
diff --git a/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.worker.js b/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.worker.js
new file mode 100644
index 00000000000000..53a61ad114ddbf
--- /dev/null
+++ b/html/canvas/offscreen/fill-and-stroke-styles/2d.gradient.conic.worker.js
@@ -0,0 +1,32 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.gradient.conic
+// Description:Conic gradient function exists
+// Note:
+
+importScripts("/resources/testharness.js");
+importScripts("/html/canvas/resources/canvas-tests.js");
+
+var t = async_test("Conic gradient function exists");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+var offscreenCanvas = new OffscreenCanvas(100, 50);
+var ctx = offscreenCanvas.getContext('2d');
+
+const g = ctx.createConicGradient(0, 0, 25);
+g.addColorStop(0, "#0f0");
+g.addColorStop(0.5, "#0f0");
+g.addColorStop(0.5, "#f00");
+g.addColorStop(1, "#f00");
+ctx.fillStyle = g;
+ctx.fillRect(0, 0, 100, 50);
+_assertPixel(offscreenCanvas, 25,25, 0,255,0,255, "25,25", "0,255,0,255");
+_assertPixel(offscreenCanvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
+_assertPixel(offscreenCanvas, 75,25, 0,255,0,255, "75,25", "0,255,0,255");
+t.done();
+
+});
+done();
diff --git a/html/canvas/tools/yaml/element/fill-and-stroke-styles.yaml b/html/canvas/tools/yaml/element/fill-and-stroke-styles.yaml
index d05ae0911bd8f9..50d28085f4c498 100644
--- a/html/canvas/tools/yaml/element/fill-and-stroke-styles.yaml
+++ b/html/canvas/tools/yaml/element/fill-and-stroke-styles.yaml
@@ -1174,10 +1174,20 @@
     @assert pixel 75,25 == 0,255,0,255;
   expected: green
 
-
-
-
-
+- name: 2d.gradient.conic
+  desc: Conic gradient function exists
+  code: |
+    const g = ctx.createConicGradient(0, 0, 25);
+    g.addColorStop(0, "#0f0");
+    g.addColorStop(0.5, "#0f0");
+    g.addColorStop(0.51, "#f00");
+    g.addColorStop(1, "#f00");
+    ctx.fillStyle = g;
+    ctx.fillRect(0, 0, 100, 50);
+    @assert pixel 25,25 == 0,255,0,255;
+    @assert pixel 50,25 == 0,255,0,255;
+    @assert pixel 75,25 == 0,255,0,255;
+  expected: green
 
 - name: 2d.pattern.basic.type
   testing:
diff --git a/html/canvas/tools/yaml/offscreen/fill-and-stroke-styles.yaml b/html/canvas/tools/yaml/offscreen/fill-and-stroke-styles.yaml
index 2554d48d26844a..7be040a13291c0 100644
--- a/html/canvas/tools/yaml/offscreen/fill-and-stroke-styles.yaml
+++ b/html/canvas/tools/yaml/offscreen/fill-and-stroke-styles.yaml
@@ -928,6 +928,22 @@
     @assert pixel 75,25 == 0,255,0,255;
     t.done();
 
+- name: 2d.gradient.conic
+  desc: Conic gradient function exists
+  code: |
+    const g = ctx.createConicGradient(0, 0, 25);
+    g.addColorStop(0, "#0f0");
+    g.addColorStop(0.5, "#0f0");
+    g.addColorStop(0.5, "#f00");
+    g.addColorStop(1, "#f00");
+    ctx.fillStyle = g;
+    ctx.fillRect(0, 0, 100, 50);
+    @assert pixel 25,25 == 0,255,0,255;
+    @assert pixel 50,25 == 0,255,0,255;
+    @assert pixel 75,25 == 0,255,0,255;
+    t.done();
+  expected: green
+
 - name: 2d.pattern.basic.image
   testing:
   - 2d.pattern.painting
