diff --git a/extensions/amp-sidebar/0.1/amp-sidebar.css b/extensions/amp-sidebar/0.1/amp-sidebar.css
index b499e295d2b2..f2843f17ddf6 100644
--- a/extensions/amp-sidebar/0.1/amp-sidebar.css
+++ b/extensions/amp-sidebar/0.1/amp-sidebar.css
@@ -28,6 +28,10 @@ amp-sidebar {
   -webkit-overflow-scrolling: touch;
 }
 
+amp-sidebar[side] {
+  display: block !important;
+}
+
 amp-sidebar[side="left"] {
   left: 0 !important;
   transform: translateX(-80vw) !important;
@@ -38,19 +42,15 @@ amp-sidebar[side="right"] {
   transform: translateX(80vw) !important;
 }
 
-.amp-sidebar-open amp-sidebar {
+amp-sidebar[side][open] {
   transform: translateX(0vw) !important;
 }
 
-.amp-sidebar-closed amp-sidebar,
-.amp-sidebar-open amp-sidebar {
+amp-sidebar[open],
+.-amp-sidebar-closed {
   transition: transform 0.5s ease;
 }
 
-.amp-sidebar-open {
-  overflow: hidden !important;
-}
-
 .-amp-sidebar-mask {
   position: fixed !important;
   top: 0 !important;
@@ -64,7 +64,3 @@ amp-sidebar[side="right"] {
   z-index: 9998 !important;
   display: none;
 }
-
-.amp-sidebar-open .-amp-sidebar-mask {
-  display: block;
-}
diff --git a/extensions/amp-sidebar/0.1/amp-sidebar.js b/extensions/amp-sidebar/0.1/amp-sidebar.js
index cca3be320cd2..0a52797886d1 100644
--- a/extensions/amp-sidebar/0.1/amp-sidebar.js
+++ b/extensions/amp-sidebar/0.1/amp-sidebar.js
@@ -39,7 +39,7 @@ export class AmpSidebar extends AMP.BaseElement {
 
   /** @override */
   isLayoutSupported(layout) {
-    return layout == Layout.CONTAINER;
+    return layout == Layout.NOLAYOUT;
   }
 
   /** @override */
@@ -67,8 +67,8 @@ export class AmpSidebar extends AMP.BaseElement {
     /** @private @const {!Viewport} */
     this.viewport_ = this.getViewport();
 
-    /** @private @const {boolean} */
-    this.hasMask_ = false;
+    /** @private @const {!Element} */
+    this.maskElement_ = false;
 
     /** @private @const {boolean} */
     this.isPaddingAdjusted_ = false;
@@ -97,9 +97,10 @@ export class AmpSidebar extends AMP.BaseElement {
       this.fixIosElasticScrollLeak_();
     }
 
-    if (this.documentElement_.classList.contains('amp-sidebar-open')) {
-      // Create the mask if the sidebar is rendered in open mode.
+    if (this.isOpen_()) {
       this.open_();
+    } else {
+      this.element.setAttribute('aria-hidden', 'true');
     }
 
     this.documentElement_.addEventListener('keydown', event => {
@@ -141,6 +142,7 @@ export class AmpSidebar extends AMP.BaseElement {
       setStyles(div, {
         'height': IOS_SAFARI_BOTTOMBAR_HEIGHT,
         'width': '100%',
+        'background-color': 'transparent',
       });
       this.element.appendChild(div);
     }
@@ -152,13 +154,22 @@ export class AmpSidebar extends AMP.BaseElement {
    * @private
    */
   toggle_() {
-    if (this.documentElement_.classList.contains('amp-sidebar-open')) {
+    if (this.isOpen_()) {
       this.close_();
     } else {
       this.open_();
     }
   }
 
+  /**
+   * Returns true if the sidebar is opened.
+   * @returns {boolean}
+   * @private
+   */
+  isOpen_() {
+    return this.element.hasAttribute('open');
+  }
+
   /**
    * Reveals the sidebar.
    * @private
@@ -170,9 +181,10 @@ export class AmpSidebar extends AMP.BaseElement {
     }
     this.mutateElement(() => {
       this.viewport_.addToFixedLayer(this.element);
-      this.createMask_();
-      this.documentElement_.classList.add('amp-sidebar-open');
-      this.documentElement_.classList.remove('amp-sidebar-closed');
+      this.openMask_();
+      this.element.setAttribute('open', '');
+      this.element.classList.remove('-amp-sidebar-closed');
+      this.element.setAttribute('aria-hidden', 'false');
       this.element./*REVIEW*/scrollTop = 1;
     });
   }
@@ -184,8 +196,10 @@ export class AmpSidebar extends AMP.BaseElement {
   close_() {
     this.viewport_.restoreOriginalTouchZoom();
     this.mutateElement(() => {
-      this.documentElement_.classList.remove('amp-sidebar-open');
-      this.documentElement_.classList.add('amp-sidebar-closed');
+      this.closeMask_()
+      this.element.removeAttribute('open');
+      this.element.classList.add('-amp-sidebar-closed');
+      this.element.setAttribute('aria-hidden', 'true');
       this.viewport_.removeFromFixedLayer(this.element);
     });
   }
@@ -217,20 +231,33 @@ export class AmpSidebar extends AMP.BaseElement {
   /**
    * @private
    */
-  createMask_() {
-    if (this.hasMask_) {
-      return;
+  openMask_() {
+    if (!this.maskElement_) {
+      const mask = this.document_.createElement('div');
+      mask.classList.add('-amp-sidebar-mask');
+      mask.addEventListener('click', () => {
+        this.close_();
+      });
+      this.element.parentNode.appendChild(mask);
+      mask.addEventListener('touchmove', e => {
+        e.preventDefault();
+      });
+      this.maskElement_ = mask;
     }
-    const mask = this.document_.createElement('div');
-    mask.classList.add('-amp-sidebar-mask');
-    mask.addEventListener('click', () => {
-      this.toggle_();
-    });
-    this.element.parentNode.appendChild(mask);
-    mask.addEventListener('touchmove', e => {
-      e.preventDefault();
+    setStyles(this.maskElement_, {
+      'display': 'block',
     });
-    this.hasMask_ = true;
+  }
+
+  /**
+   * @private
+   */
+  closeMask_() {
+    if (this.maskElement_) {
+      setStyles(this.maskElement_, {
+        'display': 'none',
+      });
+    }
   }
 
   /**
@@ -238,7 +265,7 @@ export class AmpSidebar extends AMP.BaseElement {
    */
   fixIosElasticScrollLeak_() {
     this.element.addEventListener('scroll', e => {
-      if (this.documentElement_.classList.contains('amp-sidebar-open')) {
+      if (this.isOpen_()) {
         if (this.element./*REVIEW*/scrollTop < 1) {
           this.element./*REVIEW*/scrollTop = 1;
           e.preventDefault();
diff --git a/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js b/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js
index c1bce917d54a..ea7dc88961bd 100644
--- a/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js
+++ b/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js
@@ -94,8 +94,10 @@ describe('amp-sidebar', () => {
         callback();
       };
       impl.open_();
-      expect(iframe.doc.documentElement.classList.contains('amp-sidebar-open'))
-          .to.be.true;
+      expect(sidebarElement.hasAttribute('open')).to.be.true;
+      expect(sidebarElement.getAttribute('aria-hidden')).to.equal('false');
+      expect(sidebarElement.classList.contains('-amp-sidebar-closed'))
+          .to.be.false;
     });
   });
 
@@ -108,9 +110,10 @@ describe('amp-sidebar', () => {
         callback();
       };
       impl.close_();
-      expect(
-          iframe.doc.documentElement.classList.contains('amp-sidebar-closed'))
-              .to.be.true;
+      expect(sidebarElement.hasAttribute('open')).to.be.false;
+      expect(sidebarElement.getAttribute('aria-hidden')).to.equal('true');
+      expect(sidebarElement.classList.contains('-amp-sidebar-closed'))
+          .to.be.true;
     });
   });
 
@@ -122,23 +125,20 @@ describe('amp-sidebar', () => {
       impl.mutateElement = function(callback) {
         callback();
       };
-      expect(iframe.doc.documentElement.classList.contains('amp-sidebar-open'))
+      expect(sidebarElement.hasAttribute('open')).to.be.false;
+      expect(sidebarElement.getAttribute('aria-hidden')).to.equal('true');
+      expect(sidebarElement.classList.contains('-amp-sidebar-closed'))
           .to.be.false;
-      expect(
-          iframe.doc.documentElement.classList.contains('amp-sidebar-closed'))
-              .to.be.false;
       impl.toggle_();
-      expect(iframe.doc.documentElement.classList.contains('amp-sidebar-open'))
-          .to.be.true;
-      expect(
-          iframe.doc.documentElement.classList.contains('amp-sidebar-closed'))
-              .to.be.false;
-      impl.toggle_();
-      expect(iframe.doc.documentElement.classList.contains('amp-sidebar-open'))
+      expect(sidebarElement.hasAttribute('open')).to.be.true;
+      expect(sidebarElement.getAttribute('aria-hidden')).to.equal('false');
+      expect(sidebarElement.classList.contains('-amp-sidebar-closed'))
           .to.be.false;
-      expect(
-          iframe.doc.documentElement.classList.contains('amp-sidebar-closed'))
-              .to.be.true;
+      impl.toggle_();
+      expect(sidebarElement.hasAttribute('open')).to.be.false;
+      expect(sidebarElement.getAttribute('aria-hidden')).to.equal('true');
+      expect(sidebarElement.classList.contains('-amp-sidebar-closed'))
+          .to.be.true;
     });
   });
 
@@ -150,14 +150,12 @@ describe('amp-sidebar', () => {
       impl.mutateElement = function(callback) {
         callback();
       };
-      expect(iframe.doc.documentElement.classList.contains('amp-sidebar-open'))
-          .to.be.false;
+      expect(sidebarElement.hasAttribute('open')).to.be.false;
       impl.open_();
-      expect(iframe.doc.documentElement.classList.contains('amp-sidebar-open'))
-          .to.be.true;
-      expect(
-          iframe.doc.documentElement.classList.contains('amp-sidebar-closed'))
-              .to.be.false;
+      expect(sidebarElement.hasAttribute('open')).to.be.true;
+      expect(sidebarElement.getAttribute('aria-hidden')).to.equal('false');
+      expect(sidebarElement.classList.contains('-amp-sidebar-closed'))
+          .to.be.false;
       const eventObj = document.createEventObject ?
           document.createEventObject() : document.createEvent('Events');
       if (eventObj.initEvent) {
@@ -169,11 +167,10 @@ describe('amp-sidebar', () => {
       const el = iframe.doc.documentElement;
       el.dispatchEvent ?
           el.dispatchEvent(eventObj) : el.fireEvent('onkeydown', eventObj);
-      expect(iframe.doc.documentElement.classList.contains('amp-sidebar-open'))
-          .to.be.false;
-      expect(
-          iframe.doc.documentElement.classList.contains('amp-sidebar-closed'))
-              .to.be.true;
+      expect(sidebarElement.hasAttribute('open')).to.be.false;
+      expect(sidebarElement.getAttribute('aria-hidden')).to.equal('true');
+      expect(sidebarElement.classList.contains('-amp-sidebar-closed'))
+          .to.be.true;
     });
   });
 
diff --git a/extensions/amp-sidebar/amp-sidebar.md b/extensions/amp-sidebar/amp-sidebar.md
index 62dbec087d2b..5b8d6ed3337b 100644
--- a/extensions/amp-sidebar/amp-sidebar.md
+++ b/extensions/amp-sidebar/amp-sidebar.md
@@ -71,6 +71,7 @@ Alternatively pressing the escape key on the keyboard will also close the lightb
 Example
 ```html
 <div class="hamburger" on='tap:sidebar1.toggle'></button>
+<button on='tap:sidebar1'>Open</button>
 <button on='tap:sidebar1.open'>Open</button>
 <button on='tap:sidebar1.close'>x</button>
 ```
@@ -81,17 +82,13 @@ Example
 
 The `side` attribute may be set to `left` or `right` depending upon whether sidebar should open in the left or right side of the page. If a `side` is not set on the `amp-sidebar` then it will be inherited from the `body` tag's `dir` attribute (`ltr` => `left` , `rtl` => right') and if one does not exist then the `side` is defaulted to `left`.
 
+**open**
+The `open` attribute is present on the sidebar when it is open.
+
 ## Styling
 
 The `amp-sidebar` component can be styled with standard CSS.
 
 - The `width` of the `amp-sidebar` may be set to adjust the width of the sidebar between the pre-set min(30vw) and max(80vw) values.
 - The height of the `amp-sidebar` may be set to adjust the height of the sidebar if required. If the height exceeds 100vw then the sidebar will have a vertical scrollbar. The preset height of the sidebar is 100vw and can be overridden in CSS to make it shorter.
-- The current state of the sidebar is exposed via the `amp-sidebar-open` class name that is set on the `html` tag when the side bar is open on the page.
-- The sidebar animation can be changed by overriding the following CSS selector:
-```css
-.amp-sidebar-closed amp-sidebar,
-.amp-sidebar-open amp-sidebar {
-  transition: transform 0.5s ease;
-}
-```
+- The current state of the sidebar is exposed via the `open` attribute that is set on the `amp-sidebar` tag when the side bar is open on the page.
diff --git a/test/manual/amp-sidebar.amp.html b/test/manual/amp-sidebar.amp.html
index 07585d362954..f86be98351d3 100644
--- a/test/manual/amp-sidebar.amp.html
+++ b/test/manual/amp-sidebar.amp.html
@@ -184,7 +184,7 @@
 
 </head>
 <body>
-  <amp-sidebar id='sidebar1'>
+  <amp-sidebar id='sidebar1' layout='nodisplay'>
     <ul>
       <li> Nav item 1</li>
       <li> Nav item 2</li>