diff --git a/sdk/tests/conformance/rendering/point-size.html b/sdk/tests/conformance/rendering/point-size.html
index 14d4e60ec5..42be3c1738 100644
--- a/sdk/tests/conformance/rendering/point-size.html
+++ b/sdk/tests/conformance/rendering/point-size.html
@@ -32,6 +32,7 @@
+
-
+
+
+
+
@@ -142,6 +156,54 @@
shouldBe('gl.getError()', 'gl.NO_ERROR');
test(program2);
+const trivialProg = wtu.setupProgram(gl, ['trivial-vs', 'trivial-fs']);
+gl.useProgram(trivialProg);
+wtu.glErrorShouldBe(gl, 0, 'Use trivial program.');
+
+// We don't write to gl_PointSize, but since it's supposed to be clamped within the valid range,
+// and the valid range must be positive, we should be guaranteed to get at least one pixel drawn.
+// So, just use a 1x1 FB for testing.
+gl.canvas.width = 1;
+gl.canvas.height = 1;
+gl.viewport(0, 0, 1, 1);
+
+gl.clearColor(1, 0, 0, 1);
+gl.clear(gl.COLOR_BUFFER_BIT);
+wtu.checkCanvasRect(gl, 0, 0, 1, 1, [255, 0, 0, 255]);
+
+gl.disableVertexAttribArray(0);
+gl.disableVertexAttribArray(1);
+gl.drawArrays(gl.POINTS, 0, 1);
+wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0, 255]);
+wtu.glErrorShouldBe(gl, 0, 'After trivial program draw.');
+
+if (gl.transformFeedbackVaryings) {
+ gl.transformFeedbackVaryings(trivialProg, ['gl_Position'], gl.INTERLEAVED_ATTRIBS);
+ gl.linkProgram(trivialProg);
+ gl.useProgram(trivialProg);
+ wtu.glErrorShouldBe(gl, 0, 'Relinking trivial program with TF-varyings.');
+
+ const buffer = gl.createBuffer();
+ gl.bindBufferBase(gl.TRANSFORM_FEEDBACK_BUFFER, 0, buffer);
+ gl.bufferData(gl.TRANSFORM_FEEDBACK_BUFFER, 16, gl.STREAM_READ);
+
+ gl.clear(gl.COLOR_BUFFER_BIT);
+ wtu.checkCanvasRect(gl, 0, 0, 1, 1, [255, 0, 0, 255]);
+
+ gl.beginTransformFeedback(gl.POINTS);
+
+ gl.drawArrays(gl.POINTS, 0, 1);
+ wtu.checkCanvasRect(gl, 0, 0, 1, 1, [0, 255, 0, 255]);
+
+ gl.endTransformFeedback();
+
+ gl.finish(); // Prevent 'please wait on a fence' warning.
+ window.tfResults = new Float32Array(4);
+ gl.getBufferSubData(gl.TRANSFORM_FEEDBACK_BUFFER, 0, window.tfResults);
+
+ shouldBeString('window.tfResults', new Float32Array([0, 0, 0, 1]).toString());
+}
+
var successfullyParsed = true;