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AMP ⚡ All In One

AMP ⚡ All In One

https://amp.dev/zh_cn/

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;
}

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posted @ 2020-04-23 17:07  xgqfrms  阅读(230)  评论(9)  编辑  收藏  举报