AMP

PWA

AMP Playground

https://playground.amp.dev/?runtime=amp4email

<!doctype html>

<html 4email>

<head>

  <meta charset="utf-8">

  <script async src="https://cdn.ampproject.org/v0.js"></script>

  <style amp4email-boilerplate>body{visibility:hidden}</style>

  <style amp-custom>

    h1 {

      margin: 1rem;

    }

  </style>

</head>

<body>

  <h1>Hello, I am an AMP EMAIL!</h1>

</body>

</html>

custom-element

https://github.com/ampproject

<!doctype html>

<html amp lang="en">

  <head>

    <meta charset="utf-8">

    <script async src="https://cdn.ampproject.org/v0.js"></script>

    <title>Hello, AMPs</title>

    <link rel="canonical" href="https://amp.dev/zh_cn/documentation/guides-and-tutorials/start/create/basic_markup/">

    <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">

    <script type="application/ld+json">

      {

        "@context": "http://schema.org",

        "@type": "NewsArticle",

        "headline": "Open-source framework for publishing content",

        "datePublished": "2015-10-07T12:02:41Z",

        "image": [

          "logo.jpg"

        ]

      }

    </script>

    <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>

  </head>

  <body>

    <h1>Welcome to the mobile web</h1>

  </body>

</html>

Chrome Devtools

https://developers.google.com/web/updates/2020/03/devtools

Grid Layout



/**

 * Copyright 2017 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 {ElementStub, stubbedElements} from '../element-stub';

import {createCustomElementClass} from '../custom-element';

import {extensionScriptsInNode} from '../element-service';

import {reportError} from '../error';

import {userAssert} from '../log';

/**

 * @param {!Window} win

 * @return {!Object<string, typeof ../base-element.BaseElement>}

 */

function getExtendedElements(win) {

  if (!win.__AMP_EXTENDED_ELEMENTS) {

    win.__AMP_EXTENDED_ELEMENTS = {};

  }

  return win.__AMP_EXTENDED_ELEMENTS;

}

/**

 * Registers an element. Upgrades it if has previously been stubbed.

 * @param {!Window} win

 * @param {string} name

 * @param {typeof ../base-element.BaseElement} toClass

 */

export function upgradeOrRegisterElement(win, name, toClass) {

  const knownElements = getExtendedElements(win);

  if (!knownElements[name]) {

    registerElement(win, name, toClass);

    return;

  }

  if (knownElements[name] == toClass) {

    // Already registered this instance.

    return;

  }

  userAssert(

    knownElements[name] == ElementStub,

    '%s is already registered. The script tag for ' +

      '%s is likely included twice in the page.',

    name,

    name

  );

  knownElements[name] = toClass;

  for (let i = 0; i < stubbedElements.length; i++) {

    const stub = stubbedElements[i];

    // There are 3 possible states here:

    // 1. We never made the stub because the extended impl. loaded first.

    //    In that case the element won't be in the array.

    // 2. We made a stub but the browser didn't attach it yet. In

    //    that case we don't need to upgrade but simply switch to the new

    //    implementation.

    // 3. A stub was attached. We upgrade which means we replay the

    //    implementation.

    const {element} = stub;

    if (

      element.tagName.toLowerCase() == name &&

      element.ownerDocument.defaultView == win

    ) {

      tryUpgradeElement_(element, toClass);

      // Remove element from array.

      stubbedElements.splice(i--, 1);

    }

  }

}

/**

 * This method should not be inlined to prevent TryCatch deoptimization.

 * @param {Element} element

 * @param {typeof ../base-element.BaseElement} toClass

 * @private

 * @noinline

 */

function tryUpgradeElement_(element, toClass) {

  try {

    element.upgrade(toClass);

  } catch (e) {

    reportError(e, element);

  }

}

/**

 * Stub extended elements missing an implementation. It can be called multiple

 * times and on partial document in order to start stubbing as early as

 * possible.

 * @param {!./ampdoc-impl.AmpDoc} ampdoc

 */

export function stubElementsForDoc(ampdoc) {

  const extensions = extensionScriptsInNode(ampdoc.getHeadNode());

  extensions.forEach((name) => {

    ampdoc.declareExtension(name);

    stubElementIfNotKnown(ampdoc.win, name);

  });

}

/**

 * Stub element if not yet known.

 * @param {!Window} win

 * @param {string} name

 */

export function stubElementIfNotKnown(win, name) {

  const knownElements = getExtendedElements(win);

  if (!knownElements[name]) {

    registerElement(win, name, ElementStub);

  }

}

/**

 * Copies the specified element to child window (friendly iframe). This way

 * all implementations of the AMP elements are shared between all friendly

 * frames.

 * @param {!Window} parentWin

 * @param {!Window} childWin

 * @param {string} name

 */

export function copyElementToChildWindow(parentWin, childWin, name) {

  const toClass = getExtendedElements(parentWin)[name];

  registerElement(childWin, name, toClass || ElementStub);

}

/**

 * Registers a new custom element with its implementation class.

 * @param {!Window} win The window in which to register the elements.

 * @param {string} name Name of the custom element

 * @param {typeof ../base-element.BaseElement} implementationClass

 */

export function registerElement(win, name, implementationClass) {

  const knownElements = getExtendedElements(win);

  knownElements[name] = implementationClass;

  const klass = createCustomElementClass(win);

  win['customElements'].define(name, klass);

}

/**

 * In order to provide better error messages we only allow to retrieve

 * services from other elements if those elements are loaded in the page.

 * This makes it possible to mark an element as loaded in a test.

 * @param {!Window} win

 * @param {string} elementName Name of an extended custom element.

 * @visibleForTesting

 */

export function markElementScheduledForTesting(win, elementName) {

  const knownElements = getExtendedElements(win);

  if (!knownElements[elementName]) {

    knownElements[elementName] = ElementStub;

  }

}

/**

 * Resets our scheduled elements.

 * @param {!Window} win

 * @param {string} elementName Name of an extended custom element.

 * @visibleForTesting

 */

export function resetScheduledElementForTesting(win, elementName) {

  if (win.__AMP_EXTENDED_ELEMENTS) {

    delete win.__AMP_EXTENDED_ELEMENTS[elementName];

  }

}

/**

 * Returns a currently registered element class.

 * @param {!Window} win

 * @param {string} elementName Name of an extended custom element.

 * @return {?function()}

 * @visibleForTesting

 */

export function getElementClassForTesting(win, elementName) {

  const knownElements = win.__AMP_EXTENDED_ELEMENTS;

  return (knownElements && knownElements[elementName]) || null;

}

refs

xgqfrms 2012-2020

www.cnblogs.com 发布文章使用：只允许注册用户才可以访问！

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AMP ⚡

AMP

AMP Playground

custom-element

Chrome Devtools

refs

xgqfrms 2012-2020

www.cnblogs.com 发布文章使用：只允许注册用户才可以访问！

随机推荐

热门专题

AMP ⚡

AMP

AMP Playground

custom-element

Chrome Devtools

refs

xgqfrms 2012-2020 www.cnblogs.com 发布文章使用：只允许注册用户才可以访问！

随机推荐

热门专题

xgqfrms 2012-2020

www.cnblogs.com 发布文章使用：只允许注册用户才可以访问！