Auto merge of #23557 - Manishearth:xrtest, r=asajeffrey

Test more XR things

This tests all the things that are currently possible and useful to test.

I'm going to avoid expanding rust-webvr's mock functionality for now, instead growing it in rust-webxr

Things that we support which aren't tested yet:

 - viewport values (there's no way in the xrtest api to mock these yet)
 - input (no support in rust-webvr for mocking)
 - floor spaces (no way in the xrtest api to mock these yet)

r? @asajeffrey

<!-- Reviewable:start -->
---
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3 files changed, 771 insertions, 2208 deletions

diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index b17f863e64d..98b4ea7bf8b 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -1,11 +1,5 @@
 {
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-  "conformancechecker": {
-   "mozilla/xmlhttprequest_url.html": []
-  },
-  "manual": {
-   "mozilla/xmlhttprequest_url.html": []
-  },
   "reftest": {
    "css/abs-overflow-stackingcontext.html": [
     [
@@ -7630,8 +7624,7 @@
      ],
      {}
     ]
-   ],
-   "mozilla/xmlhttprequest_url.html": []
+   ]
   },
   "reftest_node": {
    "css/border_black_groove.html": [
@@ -7645,3584 +7638,2151 @@
      ],
      {}
     ]
-   ],
-   "mozilla/xmlhttprequest_url.html": []
-  },
-  "stub": {
-   "mozilla/xmlhttprequest_url.html": []
+   ]
   },
   "support": {
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-    [
-     {}
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+    []
    ],
    "css/vertical_align_top_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/vertical_align_top_span_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/viewport_ignore_desktop.html.ini": [
-    [
-     {}
-    ]
+    []
    ],
    "css/viewport_ignore_desktop_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/viewport_percentage_vmin_vmax_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/viewport_percentage_vw_vh_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/viewport_rule_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/visibility_hidden_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/white-space-mixed-002-ref.htm": [
-    [
-     {}
-    ]
+    []
    ],
    "css/white-space-pre-line-ref.htm": [
-    [
-     {}
-    ]
+    []
    ],
    "css/white-space-pre-wrap-ref.htm": [
-    [
-     {}
-    ]
+    []
    ],
    "css/white_space_intrinsic_sizes_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/whitespace_no_affect_border_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/whitespace_nowrap_line_breaking_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/whitespace_nowrap_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/whitespace_pre_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/width_nonreplaced_block_simple_b.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/word-break-keep-all-ref-005.htm": [
-    [
-     {}
-    ]
+    []
    ],
    "css/word-break-keep-all-ref-006.htm": [
-    [
-     {}
-    ]
+    []
    ],
    "css/word-break-keep-all-ref-007.htm": [
-    [
-     {}
-    ]
+    []
    ],
    "css/word-break-keep-all-ref-008.htm": [
-    [
-     {}
-    ]
+    []
    ],
    "css/word-spacing-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "css/word_break_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/1035611-1-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/240933-2-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/356774-1-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/Chunkfive.otf": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/big.png": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/black-border-top.png": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/blank.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/block-first-child-6-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/block-first-child-7-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/block-first-child-8-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/border-collapse-bevels-1-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/color-2-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/colr-unset.ttf": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/column-balancing-nested-001-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/descriptor-ranges-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/descriptor-ranges.js": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/display-block-baselines-1-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/element-paint-recursion-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/emoji-1-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/greenbox.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/grid-item-align-002-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/grid-item-justify-001-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/image-zoom-1-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/opacity-background-1-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/size-4x4.png": [
-    [
-     {}
-    ]
+    []
    ],
    "gfx-rs-gecko/small.png": [
-    [
-     {}
-    ]
+    []
    ],
    "lint.whitelist": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/2x2.png": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/FileAPI/blob_url_upload_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/FileAPI/file-upload-frame.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/FileAPI/resource/file-submission.py": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/FileAPI/resource/upload.txt": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/adopt-panic.css": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/blank.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/canvas/set_dimensions_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/click_prevent.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/cross-origin-objects/cross-origin-postMessage-child1.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/cross-origin-objects/cross-origin-postMessage-child2.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/details_ui_closed_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/details_ui_opened_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/duplicated_scroll_ids_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/form_submit_about_frame.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/fullscreen/reftests/fullscreen-baseline-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/globals/empty.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/globals/incumbent.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/htmllabel-form-activation.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/iframe/resize_after_load_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/iframe/resources/green_inner_frame.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/iframe_child1.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/iframe_parent1.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/interfaces.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/nested_asap_script.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/partial_shadow_dom_layout_style_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/poster.png": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/remove_link_styles.css": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/remove_link_styles_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/remove_style_styles_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/reparse_style_elements_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/request_animation_frame_reftest_wait_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/background-green.css": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/background-red.css": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/brotli.py": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/external.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/first.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/http-cache.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/iframe_contentDocument_inner.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/imports-background-green.css": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/imports-background-red.css": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/no_mime_type.py": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/origin_helpers.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/range.txt": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/range_small.txt": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/remove_video_iframe_inner.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/second.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/ssl.https.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/video.mp4": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/resources/worker_success.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/restyle-out-of-document-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/scroll_root_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/scrolling_div_background_borders_background.png": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/scrolling_div_background_borders_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/service-workers/resources/sw.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/service-workers/sw.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/simple_scroll_to_fragment_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/sslfail-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/stylesheet-adopt-panic-ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/svg/svg_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/table_valign_bottom_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/table_valign_middle_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/table_valign_uneven_height_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/test.jpg": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/test.png": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/test.txt": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/textarea_placeholder_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/timer_eventInvalidation_test.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/video_poster_frame_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/clearcolor_blue.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/clearcolor_green.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/clearcolor_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/draw_arrays_simple_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/img/rust-logo-256x256.png": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/tex_image_2d_abv_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/tex_image_2d_canvas_no_context.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/tex_image_2d_canvas_no_context_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/tex_image_2d_canvas_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/tex_image_2d_mipmap_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/webgl/tex_image_2d_simple_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/syntax_error.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_alpha_throws.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_arguments_throws.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_empty_name.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_no_paint.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_not_constructor.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_paint_not_callable.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_properties_throws.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_size.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_size_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_timeout.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_paint_worklet_timeout_ref.html": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/test_worklet.js": [
-    [
-     {}
-    ]
+    []
    ],
    "mozilla/worklets/throw_exception.js": [
-    [
-     {}
-    ]
+    []
    ],
-   "mozilla/xmlhttprequest_url.html": [],
    "webxr/resources/webxr-util.js": [
     []
    ]
@@ -13943,12 +12503,6 @@
      {}
     ]
    ]
-  },
-  "visual": {
-   "mozilla/xmlhttprequest_url.html": []
-  },
-  "wdspec": {
-   "mozilla/xmlhttprequest_url.html": []
   }
  },
  "paths": {
@@ -21133,11 +19687,11 @@
    "testharness"
   ],
   "webxr/obtain_frame.html": [
-   "1089bb25c2f6b26db4e21b6bf07c28add3fee5ec",
+   "99d8fd1ef152e4030444c3ca42482d28c3e855d3",
    "testharness"
   ],
   "webxr/resources/webxr-util.js": [
-   "505173c82998a80b1e543f1a18aefaf1891f8269",
+   "b644ba72ac801bc8f659e9678d31ab23db0b7281",
    "support"
   ]
  },
diff --git a/tests/wpt/mozilla/tests/webxr/obtain_frame.html b/tests/wpt/mozilla/tests/webxr/obtain_frame.html
index 1089bb25c2f..99d8fd1ef15 100644
--- a/tests/wpt/mozilla/tests/webxr/obtain_frame.html
+++ b/tests/wpt/mozilla/tests/webxr/obtain_frame.html
@@ -8,54 +8,63 @@
           <canvas id="canvas" width="640" height="480"></canvas>
 
         <script>
-          let session;
-          let mock;
           let canvas = document.getElementById("canvas");
           let gl = canvas.getContext('webgl');
+          promise_test(async function() {
+            let mock = await navigator.xr.test.simulateDeviceConnection({supportsImmersive: true});
+            mock.setViewerOrigin({position: [0.5, 0.1, 0.1, 1], orientation: [1, 0, 0, 1] });
+            mock.setViews(TEST_VIEWS);
+            let session = await navigator.xr.requestSession({mode: "immersive-vr"});
+            await session.updateRenderState({"baseLayer": new XRWebGLLayer(session, gl, {})});
+            let resolve;
 
-          promise_test(function() {
-              return navigator.xr.test.simulateDeviceConnection({supportsImmersive: true}).then((m) => {
-                mock = m;
-                mock.setViewerOrigin({position: [0.5, 0, 0, 1], orientation: [0, 0, 0, 1] });
-                mock.setViews(TEST_VIEWS);
-                return navigator.xr.requestSession({mode: "immersive-vr"});
-              })
-              .then((s) => {
-                session = s;
-                return session.updateRenderState({"baseLayer": new XRWebGLLayer(session, gl, {})})
-              })
-              .then(() => {
-                return new Promise(function(resolve, reject) {
-                  session.requestAnimationFrame(function(time, frame) {
-                      session.requestReferenceSpace("local").then((space) => {
-                      let pose = frame.getViewerPose(space);
-                      for (view of pose.views) {
-                        assert_matrix_approx_equals(view.projectionMatrix, VALID_PROJECTION_MATRIX, 0.001, "left projection matrix");
+            let frame = await new Promise(resolve => {
+              session.requestAnimationFrame((time, frame) => resolve(frame));
+            });
 
-                        if (view.eye == "left") {
-                          assert_matrix_approx_equals(view.transform.matrix, [1,0,0,0, 0,1,0,0, 0,0,1,0, 0.4,0,0,1], 0.001, "left transform");
-                          let position = view.transform.position;
-                          assert_approx_equals(position.x, 0.4, 0.001, "left x value");
-                          assert_approx_equals(position.y, 0, 0.001, "left y value");
-                          assert_approx_equals(position.z, 0, 0.001, "left z value");
-                          assert_approx_equals(position.w, 1, 0.001, "left w value");
-                        } else if (view.eye == "right") {
-                          assert_matrix_approx_equals(view.transform.matrix, [1,0,0,0, 0,1,0,0, 0,0,1,0, 0.6,0,0,1], 0.001, "right transform");
-                          let position = view.transform.position;
-                          assert_approx_equals(position.x, 0.6, 0.001, "left x value");
-                          assert_approx_equals(position.y, 0, 0.001, "left y value");
-                          assert_approx_equals(position.z, 0, 0.001, "left z value");
-                          assert_approx_equals(position.w, 1, 0.001, "left w value");
-                        } else {
-                          reject("got unknown view");
-                        }
-                      }
-                      resolve();
-                    }).catch((e) => reject(e));
-                  });
-                });
+            let space = await session.requestReferenceSpace("local");
+            let pose = frame.getViewerPose(space);
+            assert_matrix_approx_equals(pose.transform.matrix, [1,0,0,0,0,0,1,0,0,-1,0,0,0.5,0.1,0.1,1], 0.001, "head pose matrix");
+
+            for (view of pose.views) {
+              assert_matrix_approx_equals(view.projectionMatrix, VALID_PROJECTION_MATRIX, 0.001, "projection matrix");
+              if (view.eye == "left") {
+                assert_matrix_approx_equals(view.transform.matrix,         [1,0,0,0,0,0,1,0,0,-1,0,0,0.4,0.1,0.1,1], 0.001, "left transform");
+                assert_matrix_approx_equals(view.transform.inverse.matrix, [1,0,0,0,0,0,-1,0,0,1,0,0,-0.4,-0.1,0.1,1], 0.001, "left inverse transform");
+                let position = view.transform.position;
+                assert_approx_equals(position.x, 0.4, 0.001, "left x value");
+                assert_approx_equals(position.y, 0.1, 0.001, "left y value");
+                assert_approx_equals(position.z, 0.1, 0.001, "left z value");
+                assert_approx_equals(position.w, 1, 0.001, "left w value");
+              } else if (view.eye == "right") {
+                assert_matrix_approx_equals(view.transform.matrix,         [1,0,0,0,0,0,1,0,0,-1,0,0,0.6,0.1,0.1,1], 0.001, "right transform");
+                assert_matrix_approx_equals(view.transform.inverse.matrix, [1,0,0,0,0,0,-1,0,0,1,0,0,-0.6,-0.1,0.1,1], 0.001, "right inverse transform");
+                let position = view.transform.position;
+                assert_approx_equals(position.x, 0.6, 0.001, "left x value");
+                assert_approx_equals(position.y, 0.1, 0.001, "left y value");
+                assert_approx_equals(position.z, 0.1, 0.001, "left z value");
+                assert_approx_equals(position.w, 1, 0.001, "left w value");
+              } else {
+                throw "got unknown view";
+              }
+            }
+            let offset = space.getOffsetReferenceSpace(new XRRigidTransform({x: 1, y: -1, z: 4}, {x: 0, y: 1, z: 1, w: 1}));
+            pose = frame.getViewerPose(offset);
+            for (view of pose.views) {
+              if (view.eye == "left") {
+                assert_matrix_approx_equals(view.transform.matrix, [-1/3,-2/3,2/3,0,-2/3,2/3,1/3,0,-2/3,-1/3,-2/3,0,3.4,-1.9,-0.9,1], 0.001, "left offset transform");
+              } else if (view.eye == "right") {
+                assert_matrix_approx_equals(view.transform.matrix, [-1/3,-2/3,2/3,0,-2/3,2/3,1/3,0,-2/3,-1/3,-2/3,0,3.6,-1.9,-0.9,1], 0.001, "right offset transform");
+              } else {
+                throw "got unknown view";
+              }
+            }
+            let viewer = await session.requestReferenceSpace("viewer");
+            pose = frame.getViewerPose(viewer);
+            assert_matrix_approx_equals(pose.transform.matrix, [1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1], 0.001, "viewerPose of viewer is identity");
+            assert_matrix_approx_equals(frame.getViewerPose(space).transform.matrix, frame.getPose(viewer, space).transform.matrix, 0.001, "viewerPose(space) == pose(viewer, space)");
+            assert_matrix_approx_equals(frame.getViewerPose(offset).transform.matrix, frame.getPose(viewer, offset).transform.matrix, 0.001, "viewerPose(offset) == pose(viewer, offset)");
 
-              });
           });
         </script>
     </body>
diff --git a/tests/wpt/mozilla/tests/webxr/resources/webxr-util.js b/tests/wpt/mozilla/tests/webxr/resources/webxr-util.js
index 505173c8299..b644ba72ac8 100644
--- a/tests/wpt/mozilla/tests/webxr/resources/webxr-util.js
+++ b/tests/wpt/mozilla/tests/webxr/resources/webxr-util.js
@@ -7,7 +7,7 @@ const RIGHT_OFFSET = {position: [0.1, 0, 0], orientation: [0,0,0,0]};
 let assert_matrix_approx_equals = function(m1, m2, epsilon, prefix = "") {
   assert_equals(m1.length, m2.length, prefix + "Matrix lengths should match");
   for(var i = 0; i < m1.length; ++i) {
-    assert_approx_equals(m1[i], m2[i], epsilon, m1 + prefix + "Component number " + i + " should match");
+    assert_approx_equals(m1[i], m2[i], epsilon, prefix + ": Component number " + i + " should match");
   }
 }