tests

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diff --git a/extensions/amp-story/1.0/test/test-amp-story-grid-layer.js b/extensions/amp-story/1.0/test/test-amp-story-grid-layer.js
@@ -0,0 +1,133 @@
+/**
+ * Copyright 2018 The AMP HTML Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {Action, AmpStoryStoreService} from '../amp-story-store-service';
+import {AmpDocSingle} from '../../../../src/service/ampdoc-impl';
+import {AmpStoryGridLayer} from '../amp-story-grid-layer';
+import {AmpStoryPage} from '../amp-story-page';
+import {LocalizationService} from '../../../../src/service/localization';
+import {MediaType} from '../media-pool';
+import {Services} from '../../../../src/services';
+import {registerServiceBuilder} from '../../../../src/service';
+
+describes.realWin('amp-story-grid-layer', {amp: true}, env => {
+  let win;
+  let element;
+  let gridLayerEl;
+  let page;
+  let grid;
+  let storeService;
+
+  beforeEach(() => {
+    win = env.win;
+
+    env.sandbox
+      .stub(Services, 'vsyncFor')
+      .callsFake(() => ({mutate: task => task()}));
+
+    const mediaPoolRoot = {
+      getElement: () => win.document.createElement('div'),
+      getMaxMediaElementCounts: () => ({
+        [MediaType.VIDEO]: 8,
+        [MediaType.AUDIO]: 8,
+      }),
+    };
+
+    storeService = new AmpStoryStoreService(win);
+    registerServiceBuilder(win, 'story-store', function() {
+      return storeService;
+    });
+
+    const localizationService = new LocalizationService(win);
+    registerServiceBuilder(win, 'localization', function() {
+      return localizationService;
+    });
+
+    registerServiceBuilder(win, 'performance', function() {
+      return {
+        isPerformanceTrackingOn: () => false,
+      };
+    });
+
+    const story = win.document.createElement('amp-story');
+    story.getImpl = () => Promise.resolve(mediaPoolRoot);
+
+    element = win.document.createElement('amp-story-page');
+    gridLayerEl = win.document.createElement('amp-story-grid-layer');
+    element.getAmpDoc = () => new AmpDocSingle(win);
+    element.appendChild(gridLayerEl);
+    story.appendChild(element);
+    win.document.body.appendChild(story);
+
+    page = new AmpStoryPage(element);
+    env.sandbox.stub(page, 'mutateElement').callsFake(fn => fn());
+
+    grid = new AmpStoryGridLayer(gridLayerEl);
+  });
+
+  afterEach(() => {
+    element.remove();
+  });
+
+  async function buildGridLayer() {
+    page.buildCallback();
+    await page.layoutCallback();
+    grid.buildCallback();
+    await grid.layoutCallback();
+  }
+
+  it('should set the vertical aspect-ratio', async () => {
+    gridLayerEl.setAttribute('aspect-ratio', '9:16');
+    await buildGridLayer();
+
+    storeService.dispatch(Action.SET_PAGE_SIZE, {width: 1000, height: 1000});
+
+    expect(gridLayerEl).to.have.class('i-amphtml-story-grid-template-aspect');
+    expect(
+      parseInt(
+        gridLayerEl.style.getPropertyValue('--i-amphtml-story-layer-width'),
+        10
+      )
+    ).to.equal(562);
+    expect(
+      parseInt(
+        gridLayerEl.style.getPropertyValue('--i-amphtml-story-layer-height'),
+        10
+      )
+    ).to.equal(1000);
+  });
+
+  it('should set the horizontal aspect-ratio', async () => {
+    gridLayerEl.setAttribute('aspect-ratio', '16:9');
+    await buildGridLayer();
+
+    storeService.dispatch(Action.SET_PAGE_SIZE, {width: 1000, height: 1000});
+
+    expect(gridLayerEl).to.have.class('i-amphtml-story-grid-template-aspect');
+    expect(
+      parseInt(
+        gridLayerEl.style.getPropertyValue('--i-amphtml-story-layer-width'),
+        10
+      )
+    ).to.equal(1000);
+    expect(
+      parseInt(
+        gridLayerEl.style.getPropertyValue('--i-amphtml-story-layer-height'),
+        10
+      )
+    ).to.equal(562);
+  });
+});
diff --git a/extensions/amp-story/1.0/test/validator-amp-story-grid-layer-error.html b/extensions/amp-story/1.0/test/validator-amp-story-grid-layer-error.html
@@ -0,0 +1,40 @@
+<!--
+  Copyright 2019 The AMP HTML Authors. All Rights Reserved.
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+      http://www.apache.org/licenses/LICENSE-2.0
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS-IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the license.
+-->
+<!--
+  Test Description:
+  Tests for the live story functionality inside amp-story.
+-->
+<!doctype html>
+<html amp lang="en">
+  <head>
+    <meta charset="utf-8">
+    <script async src="https://cdn.ampproject.org/v0.js"></script>
+    <script async custom-element="amp-story"
+        src="https://cdn.ampproject.org/v0/amp-story-1.0.js"></script>
+    <title>amp-story-grid-layer</title>
+    <meta name="viewport"
+          content="width=device-width,minimum-scale=1,initial-scale=1">
+    <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
+    <link rel="canonical" href="index.html">
+  </head>
+
+  <body>
+    <amp-story standalone>
+      <amp-story-page>
+        <amp-story-grid-layer aspect-ratio="a:b" template="vertical">
+        </amp-story-grid-layer>
+      </amp-story-page>
+    </amp-story>
+  </body>
+
+</html>
diff --git a/extensions/amp-story/1.0/test/validator-amp-story-grid-layer-error.out b/extensions/amp-story/1.0/test/validator-amp-story-grid-layer-error.out
@@ -0,0 +1,43 @@
+FAIL
+|  <!--
+|    Copyright 2019 The AMP HTML Authors. All Rights Reserved.
+|    Licensed under the Apache License, Version 2.0 (the "License");
+|    you may not use this file except in compliance with the License.
+|    You may obtain a copy of the License at
+|        http://www.apache.org/licenses/LICENSE-2.0
+|    Unless required by applicable law or agreed to in writing, software
+|    distributed under the License is distributed on an "AS-IS" BASIS,
+|    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+|    See the License for the specific language governing permissions and
+|    limitations under the license.
+|  -->
+|  <!--
+|    Test Description:
+|    Tests for the live story functionality inside amp-story.
+|  -->
+|  <!doctype html>
+|  <html amp lang="en">
+|    <head>
+|      <meta charset="utf-8">
+|      <script async src="https://cdn.ampproject.org/v0.js"></script>
+|      <script async custom-element="amp-story"
+|          src="https://cdn.ampproject.org/v0/amp-story-1.0.js"></script>
+|      <title>amp-story-grid-layer</title>
+|      <meta name="viewport"
+|            content="width=device-width,minimum-scale=1,initial-scale=1">
+|      <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
+|      <link rel="canonical" href="index.html">
+|    </head>
+|
+|    <body>
+|      <amp-story standalone>
+|        <amp-story-page>
+|          <amp-story-grid-layer aspect-ratio="a:b" template="vertical">
+>>     ^~~~~~~~~
+amp-story/1.0/test/validator-amp-story-grid-layer-error.html:35:6 The attribute 'aspec-ratio' in tag 'amp-story-grid-layer' is set to the invalid value 'a:b'. (see https://amp.dev/documentation/components/amp-story)
+|          </amp-story-grid-layer>
+|        </amp-story-page>
+|      </amp-story>
+|    </body>
+|
+|  </html>
diff --git a/extensions/amp-story/1.0/test/validator-amp-story-grid-layer.html b/extensions/amp-story/1.0/test/validator-amp-story-grid-layer.html
@@ -0,0 +1,40 @@
+<!--
+  Copyright 2019 The AMP HTML Authors. All Rights Reserved.
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+      http://www.apache.org/licenses/LICENSE-2.0
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS-IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the license.
+-->
+<!--
+  Test Description:
+  Tests for the live story functionality inside amp-story.
+-->
+<!doctype html>
+<html amp lang="en">
+  <head>
+    <meta charset="utf-8">
+    <script async src="https://cdn.ampproject.org/v0.js"></script>
+    <script async custom-element="amp-story"
+        src="https://cdn.ampproject.org/v0/amp-story-1.0.js"></script>
+    <title>amp-story-grid-layer</title>
+    <meta name="viewport"
+          content="width=device-width,minimum-scale=1,initial-scale=1">
+    <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
+    <link rel="canonical" href="index.html">
+  </head>
+
+  <body>
+    <amp-story standalone>
+      <amp-story-page>
+        <amp-story-grid-layer aspect-ratio="9:16" template="vertical">
+        </amp-story-grid-layer>
+      </amp-story-page>
+    </amp-story>
+  </body>
+
+</html>
diff --git a/extensions/amp-story/1.0/test/validator-amp-story-grid-layer.out b/extensions/amp-story/1.0/test/validator-amp-story-grid-layer.out
@@ -0,0 +1,41 @@
+PASS
+|  <!--
+|    Copyright 2019 The AMP HTML Authors. All Rights Reserved.
+|    Licensed under the Apache License, Version 2.0 (the "License");
+|    you may not use this file except in compliance with the License.
+|    You may obtain a copy of the License at
+|        http://www.apache.org/licenses/LICENSE-2.0
+|    Unless required by applicable law or agreed to in writing, software
+|    distributed under the License is distributed on an "AS-IS" BASIS,
+|    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+|    See the License for the specific language governing permissions and
+|    limitations under the license.
+|  -->
+|  <!--
+|    Test Description:
+|    Tests for the live story functionality inside amp-story.
+|  -->
+|  <!doctype html>
+|  <html amp lang="en">
+|    <head>
+|      <meta charset="utf-8">
+|      <script async src="https://cdn.ampproject.org/v0.js"></script>
+|      <script async custom-element="amp-story"
+|          src="https://cdn.ampproject.org/v0/amp-story-1.0.js"></script>
+|      <title>amp-story-grid-layer</title>
+|      <meta name="viewport"
+|            content="width=device-width,minimum-scale=1,initial-scale=1">
+|      <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style><noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript>
+|      <link rel="canonical" href="index.html">
+|    </head>
+|
+|    <body>
+|      <amp-story standalone>
+|        <amp-story-page>
+|          <amp-story-grid-layer aspect-ratio="9:16" template="vertical">
+|          </amp-story-grid-layer>
+|        </amp-story-page>
+|      </amp-story>
+|    </body>
+|
+|  </html>
diff --git a/extensions/amp-story/amp-story-grid-layer.md b/extensions/amp-story/amp-story-grid-layer.md
@@ -60,6 +60,21 @@ Example:
 </amp-story-grid-layer>
 ```
 
+### aspect-ratio [optional]
+
+The value specifies an aspect ratio in the "horizontal:vertical" format, where both "horizontal" and "vertical" are integer numbers. If this attribute is specified, the layout of the grid layer is set to conform to the specified proportions. The font size, in this case, is automatically set to the 1/10th of the resulting height to enable proportional content scaling.
+
+Example:
+
+```html
+<amp-story-grid-layer aspect-ratio="9:16" template="vertical">
+  <div style="width: 10%; height: 10%; font-size: 2em;">
+    This block will be in 9:16 aspect ratio and font size will be set at the
+    20% of the layer's height.
+  </div>
+</amp-story-grid-layer>
+```
+
 ## Templates
 
 The following are available templates to specify for the layout of the grid layer.

diff --git a/extensions/amp-story/validator-amp-story.protoascii b/extensions/amp-story/validator-amp-story.protoascii
@@ -151,6 +151,10 @@ tags: {  # <amp-story-grid-layer>
     value: "landscape-half-left"
     value: "landscape-half-right"
   }
+  attrs: {
+    name: "aspect-ratio"
+    value_regex: "\\d+:\\d+"
+  }
   descendant_tag_list: "amp-story-grid-layer-allowed-descendants"
   reference_points: {
     tag_spec_name: "AMP-STORY-GRID-LAYER default"