README

AMP Plugin for WordPress

Enable AMP on your WordPress site, the WordPress way.

Contributors: automattic, xwp, google, westonruter, ryankienstra, batmoo, stubgo, albertomedina, tweetythierry, joshuawold, postphotos
Tags: amp, mobile
Requires at least: 4.9
Tested up to: 5.0
Stable tag: 1.0.2
License: GPLv2 or later
Requires PHP: 5.3.6

Description

The AMP Project is an open-source initiative aiming to make the web better for all. AMP enables web experiences that are consistently fast, beautiful and high-performing across distribution platforms. The Official AMP Plugin for WordPress supports fully integrated AMP publishing for WordPress sites, with robust capabilities and granular publisher controls.

Features and capabilities provided by the plugin include:

Compatibility Tool: to assist the development of AMP experiences by enabling AMP debugging with detailed information about validation errors that may exist, the markup/scripts causing them, and the specific components on site (e.g theme, plugin, core) responsible for that page content.
CSS Tree Shaking: to assist in dealing with cases where the defined CSS rules on a site exceed the CSS size limit allowed on single AMP pages.
Core Theme Support: enabling full AMP validity for four default themes (i.e. Twenty Fifteen, Twenty Sixteen, Twenty Seventeen, Twenty Nineteen).
Gutenberg Support: enabling AMP content creation fully integrated with Gutenberg.
AMP-first Experiences support: enabling full-site AMP experiences without sacrificing the flexibility of the platform, or the fidelity of content.
Many Optimizations: A myriad of code, performance, and developer experience improvements: from customization flexibility, to better UI flows, internationalization, accessibility, etc.

With the official AMP plugin for WordPress, the WordPress ecosystem is provided with the capabilities and tools it needs to build world-class AMP experiences without deviating from its standard, flexible, and well-known content creation workflow.

Installation

Upload the folder to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.
If you currently use older versions of the plugin in Classic mode, it is strongly encouraged to migrate to Paired or Native mode.

Getting Started

To learn more about the plugin and start leveraging its capabilities to power your AMP content creation workflow check the official AMP plugin product site.

If you are a developer, we encourage you to follow along or contribute to the development of this plugin on GitHub.

Screenshots

Theme support enables you to reuse the active theme's templates and stylesheets; all WordPress features (menus, widgets, comments) are available in AMP.

Many themes can be served as AMP without any changes; the default experience is as if JavaScript is turned off in the browser since scripts are removed.

Classic templates are still available, but they are are limited. Not only do they differ from the active theme, any validation errors are silently sanitized.

Switch from Classic to Paired or Native modes in AMP settings screen. You may need to disable the admin bar in AMP if your theme has a larger amount of CSS.

Make the entire site available in AMP or pick specific post types and templates; you can also opt-out on per-post basis.

Plugin checks for AMP validity and will indicate when either: no issues are found, new issues need moderation, or issues block AMP from being served.

The editor will surface validation issues during content authoring. The specific blocks with validation errors are indicated.

Validated URLs include the list of validation errors encountered, giving control over whether sanitization for a validation error is accepted or rejected.

Styles added by themes and plugins are automatically concatenated, minified, and tree-shaken to try to keep the total under 50KB of inline CSS.

A WP-CLI command is provided to check the URLs on a site for AMP validity. Results are available in the admin for inspection.

Changelog

1.0.2 (2019-01-18)

Gracefully handle conflicting version of PHP-CSS-Parser being loaded. This issue was specifically noticed when the Mailpoet plugin is active. See #1743. Props westonruter.
Fix erroneous enqueueing of AMP validation screen JS/CSS assets on non-AMP admin screens. See #1798, #1796. Props westonruter, geminorum.
Fix content smooth scrolling in Twenty Seventeen theme. #1777, #1830. Props westonruter.
Update welcome prompt to point to Getting Started section on amp-wp.org. See #1799. Props westonruter.
Add _doing_it_wrong() when calling is_amp_endpoint() before queried object is available. This ensures that themes and plugins will get accurate responses when calling is_amp_endpoint() in paired/native modes. See #1794. Props westonruter, flixos90 (felixarntz).
Eliminate obsolete i18n code. See #1789. Props swissspidy, westonruter.
Prevent re-bundling WordPress packages which are shipped in 5.0. See #1781, #1828. Props westonruter, flixos90 (felixarntz).
Fix handling of stylesheets for themes that are located in additional theme directories. See #1790. Props westonruter.
Improve checks for users who install the plugin from source on GitHub. See #1774. Props westonruter.
Improve reliability of phpunit test runs across environments. See #1776. Props westonruter.

See 1.0.2 release.

1.0.1 (2018-12-12)

Add check for required iconv extension. See #1727. Props westonruter.
Plugin Conflict: Also using Give plugin currently creates 500 server error when viewing /wp-admin/. See #1720. Props KZeni, westonruter.
Fix Plugin Conflict with Give plugin (previously created 500 server error when viewing site admin). See #1725. Props KZeni.
Second argument of the_title filter is an Int not WP_Post. See #1723. Props lesterchan, westonruter.
Prevent image with caption from overflowing its container in Classic mode. See #1728. Props kienstra.
Ensure Schema.org meta data has correct date. See #1721. Props westonruter.

See 1.0.1 release.

1.0.0 (2018-12-05)

To learn how to use the new features in this release, please see the documentation for Serving Strategies and Implementing Interactivity.

Add runtime CSS minification, !important replacement, and tree shaking. See #1048, #1111, #1142, #1320, #1073. Props westonruter, hellofromtonya, amedina, pbakaus, igrigorik, camelburrito.
Keep track of new validation errors and add ability to accept/reject in order to allow or block AMP for a given URL. See #1003. Props westonruter.
Redesign screens for Invalid URLs and Error Index. See #1394, #1361, #1444, #1448, #1452, #1397, #1446, #1364, #1449, #1418, #1451, #1429, #1408, #1414, #1409, #1373, #1462, #1471, #1485. Props kienstra, johnwatkins0, miina, jacobschweitzer, westonruter.
Extend admin screen options to add amp theme support without any coding required. Toggle between classic, paired, and native. Includes options for whether sanitization should be done by default and whether tree shaking should always be allowed. See #1199, #1291, #1264. Props westonruter, AdelDima.
Add support for allowing a site subset to be native AMP. See #1235. Props westonruter.
Add an admin pointer for updated AMP settings screen for version 1.0. See #1271, #1254. Props kienstra.
Add support for three core themes (Twenty Fifteen, Twenty Sixteen, Twenty Seventeen) so that they can be used out of the box with AMP theme support added without needing to create a child theme. See #1074. Props westonruter, DavidCramer, kienstra.
Add AMP support for Twenty Nineteen. See #1587, #1619. Props westonruter.
Add AMP menu item to admin bar on frontend with indication of AMP validation status; accessing an AMP URL that has unaccepted validation errors will redirect to the non-AMP page and cause the AMP admin bar item to indicate the failure, along with a link to access the validation results. See #1199. Props westonruter.
Add dynamic handling of validation errors. See #1093, #1063, #1087. Props westonruter.
Add AMP validation of blocks. See #1019. Props westonruter.
Add AMP-specific functionality to core blocks. See #1026, #1008. Props miina.
Add AMP media blocks (when in native AMP mode). See #1155. Props miina.
Add embed handler for Gfycat. See #1136. Props miina.
Add amp-mathml block. See #1165. Props miina.
Add Gutenberg amp-timeago block. See #1168. Props miina.
Add amp-fit-text support to text blocks. See #1151. Props miina.
Fix handling of font stylesheets with non-HTTPS scheme or scheme-less URLs. See #1077. Props westonruter.
Fix issues in displaying native blocks. See #1022. Props miina.
Gutenberg: Add AMP Carousel for Gallery and AMP Lightbox features for Gallery and Image. See #1121, #1065, #1187. Props miina, westonruter.
Add "Enable AMP" toggle in Gutenberg editor. See #1275, #1230. Props kienstra.
Cache post processor response. See #1156, #959. Props ThierryA.
Add preload links & resource hints, and optimize order of elements in head. See #1295. Props westonruter.
Automatically redirect to ?amp from /amp/ URLs when amp theme support is present. See #1203, #1194. Props westonruter.
Incorporate Server Timing API. See #990. Props westonruter.
Add information about stylesheets included and excluded in style[amp-custom]. See #1135. Props westonruter.
Fetch (local) stylesheets with @import, instead of removing them. See #1181. Props miina.
Fetch external stylesheets (which aren't from whitelisted font CDNs) to include in amp-custom style. See #1174. Props miina.
Transform CSS selectors according to sanitizer HTML element to AMP component conversions. See #1175. Props miina, westonruter.
Rework displaying block validation messages. See #1682. Props miina.
Ensure layout attributes are only allowed on supporting elements. See #1075. Props westonruter.
Correct the width attribute in col tags to the equivalent CSS rule. See #1064. Props amedina.
Ensure that video source elements use HTTPS. See #1274, #976. Props hellofromtonya.
Preserve whitespace when serializing the DOM as HTML. See #1309, #1304. Props westonruter.
Fix reporting the removal of unrecognized elements. See #1287, #1100. Props hellofromtonya.
Remove space from data: url() in stylesheets. See #1164, #1089. Props amedina, JonHendershot, westonruter, mehigh, davisshaver, Mte90.
Fix inconsistency between singular and plural. See #1114. Props garrett-eclipse.
Disable AMP admin menu option when the AMP Customizer is not enabled or theme support is enabled. See #1080. Props oscarssanchez.
Allow spaces around commas in value property lists. See #1112. Props westonruter.
Restore admin bar on AMP pages and improve AMP menu items. See #1219. Props westonruter.
Remove empty media queries. See #1423. Props korobochkin, westonruter.
Update PHP-CSS-Parser and include tree shaker effectiveness in style[amp-custom] manifest comment. See #1650. Props westonruter.
Display admin notice if there's no persistent object caching. See #1050. Props oscarssanchez.
Re-use styling for unmoderated comments to apply to new accepted/rejected validation errors. See #1458. Props westonruter, johnwatkins0, jacobschweitzer.
Update PHP-CSS-Parser to use new calc() support. See #1116, #1284. Props westonruter.
Fix parsing CSS selectors which contain commas. See #1286. Props westonruter.
Add sanitizer to support amp-o2-player. See #1202. Props juanchaur1.
Update contributing.md and add code of conduct. See #1649. Props amedina.
Add AMP_Embed_Sanitizer. See #1128. Props juanchaur1.
Add AMP_Script_Sanitizer to replace noscript elements with their contents. See #1226. Props westonruter.
Update generated tags file to 767. See #1665. Props miina.
Fix header image filtering and YouTube header video detection. See #1208. Props westonruter.
Improve support for Hulu & Imgur embeds. See #1218. Props miina.
Fix integration with WordPress 5.0. See #1520. Props miina.
Update spec generated from amphtml to file revision 675 and AMP v1531357871900. See #1312. Props westonruter.
Opt-in to CORS mode for external font stylesheet links. See #1289. Props westonruter.
PHPCS fixes, including PHP DocBlocks and strict comparisons. See #1002. Props paulschreiber.
Fix generation of validation error when element has multiple invalid attributes. See #1461. Props westonruter.
Prevent empty term status from being interpreted as new-rejected during bulk change. See #1460. Props westonruter.
Add script to create built tag. See #1209. Props westonruter.
Fix handling of amp-bind attributes to ensure that “>” can appear inside attribute values. See #1119. Props westonruter.
Tree-shake CSS selectors for HTML elements that target non-active languages. See #1221. Props westonruter.
Redirect to post list table in case of admin bar validate request failure. See #1229. Props westonruter.
Amend AMP style elements with sourceURL comment for DevTools to be able to perform CSS code coverage. See #1584. Props westonruter.
Prevent erroneously tree-shaking keyframe selectors like from, to, and percentages. See #1211. Props westonruter.
Add caching of redirect to non-AMP URL when validation errors present. See #1207. Props westonruter.
Discontinue using 'latest' version of component scripts. See #1464. Props westonruter.
Ensure font stylesheets are requested in CORS mode in both AMP and non-AMP documents. See #1486. Props westonruter.
Move any content output during shutdown to be injected before closing body tag. See #1102. Props westonruter.
Fix obtaining source for widgets. See #1212. Props westonruter.
Address issue where <ul> is converted to an <amp-carousel>. See #1529. Props kienstra.
Construct schema.org meta script by appending text node. See #1220. Props westonruter.
Eliminate amp-wp-enforced-sizes style from theme support stylesheet. See #1153. Props westonruter.
Add support for extracting (pixel) dimensions from SVG images. See #1150. Props westonruter.
Ensure redirect is only done if there are unsanitized errors. See #1241. Props westonruter.
Deprecate AMP_WP_Utils, in favor of wp_parse_url(). See #995. Props paulschreiber.
Add WP-CLI script to test support for blocks. See #845. Props kienstra.
Ensure translatable strings in blocks can actually be translated. See #1173. Props miina, swissspidy, westonruter.
Look in entire document for Schema.org metadata not just head. See #1664. Props westonruter.
Fix title display of Invalid URL page. See #1463. Props amedina.
Add native/paired/classic mode to AMP generator meta. See #1465. Props westonruter.
Prevent is_amp_endpoint() from triggering notice when called on login, signup, or activate screens. See #1250. Props felixarntz.
Support extracting dimensions for single URLs. See #793. Props mjangda, mdbitz.
Improve validation and presentation of analytics form. See #1299, #1133, #1296. Props westonruter, AdelDima.
Prevent validation of auto-drafts, including when merely accessing New Post screen. See #1301. Props westonruter.
Fix inability to move link element due to assigned parent. See #1322. Props westonruter.
Gutenberg: Remove 'type' from attributes where 'source' is set. See #1622. Props miina.
Gutenberg: Fix displaying validation warning and usage of PHP function. See #1612. Props miina.
Fix stretched images in Twenty Seventeen them and Gutenberg. See #1321, #1281, #1237. Props hellofromtonya.
Fix image dimension extractor so it does not disregard duplicate images. See #1314. Props lukas9393.
Improve organization of third party code. See #1657. Props westonruter.
Short-circuit polldaddy shortcode when no poll or survey supplied. See #1621. Props westonruter.
Remove redundant version from composer.json and add PHP version requirement. See #1333, #1328, #1334, #1332. Props swissspidy.
Add warning when AMP plugin is installed in incorrect directory. See #1593. Props westonruter.
Store validation errors in order of occurrence in document. See #1335. Props westonruter.
Add .editorconfig file. See #1336, #51. Props swissspidy.
Update i18n to make use of updated WP-CLI command. See #1329, #1327, #1341, #1345, #1393. Props swissspidy, felixarntz, westonruter.
Use all eligible post types when all_templates_supported is selected. See #1338, #1302, #1344. Props hellofromtonya, westonruter.
Address an issue with an invalid embed. See #1661. Props kienstra.
Do not show fallback source as active theme if no validation errors. See #1592. Props westonruter.
Respect default AMP enabled status when creating a new post in Gutenberg. See #1339. Props hellofromtonya.
Fix incorrect attribution of theme as source for content validation errors. See #1467. Props westonruter.
Move AMP Settings in editor to after default settings. See #1652. Props miina.
Fix conversion of video to amp-video. See #1477. Props westonruter.
Add new icon, text, and style to splash notice. See #1470. Props jacobschweitzer.
Normalize 'ver' query param in script/style validation errors to prevent recurrence after accepted. See #1346. Props westonruter.
Add bing-amp.com to the list of AMP Cache hosts. See #1447. Props westonruter.
Add missing tabindex attribute to lightbox images. See #1350. Props amedina.
Update AMP spec to 757 (v1811091519050). See #1588. Props westonruter, kienstra.
Detect ineffectual post-processor response cache due to high MISS rates and auto-disable. See #1325, #1239. Props hellofromtonya, westonruter.
Update regex for tag selectors. See #1534. Props swissspidy, westonruter.
Update the validator spec version to 720 and AMP v1534879991178; add support for reference points. See #1315, #1386, #1330. Props westonruter.
Update spec from revision 720 to 734. See #1475. Props kienstra.
Fix form sanitizer's handling of relative actions by making them absolute. See #1352, #1349. Props ricardobrg.
Skip Server-Timing header if not WP_DEBUG and user cannot manage_options. See #1354. Props westonruter.
Fetch CSS over HTTP when URL lacks extension; convert font CDN stylesheets @imports to convert to links instead of fetching. See #1357, #1317. Props westonruter.
Add WP-CLI command for testing the AMP compatibility of an entire site. See #1183, #1007. Props kienstra, westonruter.
Update screenshots. See #1701. Props westonruter, amedina.
Update the description of the AMP project in readme file. See #1693. Props amedina.
Use new banner images. See #1692. Props cathibosco.
Display when validation results are stale due to active theme/plugin changes. See #1375. Props westonruter.
Fix displaying of expected notices when theme support enabled by theme. See #1374, #1358. Props westonruter.
Update native mode description to mention AMP-first. See #1703. Props westonruter.
Fix handling responses to form submissions from an AMP Cache. See #1382, #1356.
Replace Gutenberg's deprecated isCleanNewPost selector. See #1387. Props miina.
Updates php-css-parser to include fix for parsing calc() with negative values. See #1392. Props westonruter.
Add embed support for Twitter timelines via new amp-twitter attributes. See #1396. Props felixarntz.
Eliminate obsolete sudo:false from Travis config. See #1651. Props westonruter.
Fix tooltip position. See #1472. Props jacobschweitzer.
Add error type filters on validation error and invalid URL screens. See #1373. Props kienstra.
Default to auto sanitization and tree shaking being enabled. See #1402. Props westonruter.
Prevent the admin pointer from staying below the viewport. See #1694. Props kienstra.
Omit validation errors sanitized by filter or tree-shaking option; since sanitization is forced, there is no point to store. See (#1413)[ampproject#1413]. Props westonruter.
Prevent URL validation from happening during bulk imports. See #1424, #1404. Props westonruter.
Normalize invalid URL stored for amp_validated_url post type. See #1436. Props westonruter.
Make the default layout responsive for the <amp-ooyala-player> block. See #1585. Props kienstra.
Add default values for AMP Timeago block. See #1586. Props kienstra.
Expose and store queried object for validated URL; show edit link. See #1426, #1428, #1433. Props westonruter.
Re-validate the site when switching modes and show the results in a notice. See #1443. Props kienstra, westonruter.
Improve access to AMP admin screens for users who are not administrators. #1437. Props westonruter.
Display a welcome notice on the main 'AMP Settings' page. See #1442. Props kienstra.
Fix URL protocol validation and parsing attribute values with multiple URLs. See #1411, #1410. Props westonruter.
Prevent a notice from appearing in the Compatibility Tool meta box. See #1605. Props kienstra.
Restore ability to customize 'amp' query var when theme support added. #1455. Props westonruter.
Add slug constants for theme support and post type support. #1456. Props westonruter.
Fix ability to add AMP support for custom post types. See #1441. Props westonruter.
Fix stretched logo and header issues in Twenty Seventeen. #1419. Props westonruter.
Add caption support to all amp-instagram embeds. See #1438, #822. Props chandrapatel.
Fix PHP warning generated by calls to idn_to_utf8(). See #1440, #1439. Props kraftbj.
Fix PHP fatal error during AMP validation when a plugin uses a class method as an output buffer callback. #1453. Props westonruter.
Update minimum PHP version from 5.3.2 to 5.3.6. See #1407, #1406. Props westonruter.
Improve package.json and composer.json. See #1405. Props swissspidy.
Ensure PHP file generated for use by translate.wordpress.org is free of syntax errors. See #1427, #1416. Props swissspidy, westonruter.

For a full list of the closed issues and merged pull requests in this release, see the 1.0 milestone.

Contributors in this release, including design, development, testing, and project management: Adel Tahri (AdelDima), Alberto Medina (amedina), Anne Louise Currie (alcurrie), Brandon Kraft (kraftbj), Cathi Bosco (cathibosco), Chandra Patel (chandrapatel), Claudio Sossi, Daniel Walmsley (gravityrail), David Cramer (DavidCramer), Felix Arntz (felixarntz), Garrett Hyder (garrett-eclipse), Jacob Schweitzer (jacobschweitzer), John Watkins0 (johnwatkins0), Joshua Wold (jwold), Juan Chaur (juanchaur1), Kevin Coleman (kevincoleman), Leo Postovoit (postphotos), Lukas Hettwer (lukas9393), Mackenzie Hartung (MackenzieHartung), Matthew Denton (mdbitz), Miina Sikk (miina), Mohammad Jangda (mjangda), Pascal Birchler (swissspidy), Oscar Sánchez (oscarssanchez), Paul Schreiber (paulschreiber), Ricardo Gonçalves (ricardobrg), Ryan Kienstra (kienstra), Thierry Muller (ThierryA), Tonya Mork (hellofromtonya), Weston Ruter (westonruter).

0.7.2 (2018-06-27)

Prevent plugins from outputting custom scripts in classic templates via wp_print_scripts action. See #1225, #1227. Props westonruter.
Introduce amp_render_scripts() to print AMP component scripts and nothing else. See #1227. Props westonruter.
Display Schema.org image data for 'attachment' post type. See #1157, #1176. Props kienstra.
Output alt attribute in legacy templating gravatar image. See #1179. Props kienstra.

See 0.7.2 milestone.

0.7.1 (2018-05-23)

Limit showing AMP validation warnings to when amp theme support is present. See #1132. Props westonruter.
Supply the extracted dimensions to images determined to need them; fixes regression from 0.6 this is key for Gutenberg compat. See #1117. Props westonruter.
Ensure before/after is amended to filtered comment_reply_link. See #1118. Props westonruter.
Force VideoPress to use html5 player for AMP. See #1125. Props yurynix.
Soft-deprecate AMP_Base_Sanitizer::get_body_node() instead of hard-deprecating it (with triggered notice). See #1141. Props westonruter.
Pass '/' as an argument to home_url(), preventing possible 404. See #1158, #1161. Props kienstra.
Deprecate Jetpack helper and some parts of WPCOM helper for Jetpack 6.2. See #1149. Props gravityrail.

See 0.7.1 milestone.

0.7.0 (2018-05-03)

Render an entire site as "Native AMP" if the theme calls add_theme_support( 'amp' ). See #857, #852, #865, #888. Props westonruter, kaitnyl, ThierryA.
Use the AMP spec to automatically discover the required AMP component scripts to include on the page while post-processing. See #882, #885. Props westonruter.
Automatically concatenate stylesheets from style tags with loaded stylesheets from link tags combined in one style[amp-custom]. See #887, #890, #935. Props westonruter.
Update serialization to use HTML instead of XML; update minimum version of PHP fro, 5.2 to 5.3. See #891.
Add support for widgets. See #870. Props kienstra.
Add support for forms. See #907, #923. Props DavidCramer.
Use "Paired Mode" if the theme calls add_theme_support( 'amp' ) and passes a 'template_dir' value for the AMP templates. See #856, #877. Props westonruter, kaitnyl.
Add AMP implementations of audio/video playlists. See #954. Props kienstra.
Allow full Customization when the theme supports 'amp'. See #952. Props westonruter.
Add support for all default WordPress widgets. See #921, #917. Props kienstra, westonruter.
Add support for more default embeds: Issuu, Post, Meetup, Reddit, Screencast, Tumblr, and WordPress Plugin Directory. See #889. Props kaitnyl.
Allow native WordPress commenting, in fully valid AMP. See #1024, #1029, #871, #909. Props DavidCramer, westonruter.
Add a UI for displaying validation errors, including invalid tags and attributes, with tracing for the source for each error according to which theme/plugin's shortcode, widget, or other hook is responsible. Includes debug mode to suspend sanitizer. See #971, #1012, #1016. Props westonruter, kienstra.
On activating a plugin, validate a front-end page and display a notice if there were errors. See #971. Props westonruter, kienstra.
Creation of AMP-related notifications, on entering invalid content in the 'classic' editor. See #912. Props kienstra, westonruter, ThierryA.
Optionally use <amp-live-list> to display comments, avoiding full-page refreshes on adding comments. And enable making requests for an <amp-live-list>, like for displaying posts. See #1029, #915. Props DavidCramer, westonruter.
Support <amp-bind>, enabling more dynamic elements. See #895. Props westonruter.
Add output buffering, ensuring the entire page is valid AMP. See #929, #857, #931. Props westonruter, ThierryA.
Add validation of host names in URLs. See #983. Props rubengonzalezmrf.
Add WP-CLI scripts to test AMP support of comments and widgets. See #924, #859. Props DavidCramer, kienstra.
Improve test coverage, including for AMP_Theme_Support. See #1034. Props DavidCramer, kienstra.
Update the generated sanitizer file to the AMP spec, and simplify the file that generates it. See #929, #926. Props westonruter.
Several sanitizer updates, including for styles, and preventing valid tags from being removed. See #935, #944, #952. Props westonruter, davisshaver.
Improve sanitization of <amp-img>, <amp-video>, and <amp-iframe>. See #937, #1054. Props kienstra, amedina.
Fix an issue where the JSON inside <script type="application/json"> was wrapped with CDATA. See #891. Props westonruter.
Allow use of AMP components outside of AMP documents, including in PWA. See #1013. Props westonruter.
Access the AMP query var with amp_get_slug(), instead of AMP_QUERY_VAR. See #986. Props westonruter, mjangda.
Update build scripts, including PHP versions in .travis.yml. See #1058, #949. Props westonruter.
Prevent New Relic script from being injected in AMP responses. See #932. Props westonruter.
Fix handling of 0 and empty height/width attributes. See #979. Props davisshaver.

For a full list of the closed issues and merged pull requests in this release, see the 0.7 milestone.

Contributors in this release, including design, development, testing, and project management: Adam Silverstein (adamsilverstein), Alberto Medina (amedina), Christian Chung (christianc1), Claudio Sossi, David Cramer (DavidCramer), Davis Shaver (davisshaver), Douglas Paul (douglyuckling), Jason Johnston (jhnstn), Joshua Wold (jwold), Kaitlyn (kaitnyl), Leo Postovoit (postphotos), Mackenzie Hartung (MackenzieHartung), Maxim Siebert (MaximSiebert), Mike Crantea (mehigh), Mohammad Jangda (mjangda), Oscar Sanchez (oscarssanchez), Philip John (philipjohn), Piotr Delawski (delawski), Renato Alves (renatonascalves), Rubén (rubengonzalezmrf), Ryan Kienstra (kienstra), Tanya Herman, Thierry Muller (ThierryA), vortfu, Weston Ruter (westonruter), Ziga Sancin (zigasancin).

0.6.2 (2018-02-28)

Improve logic and use of escaping; limit flushing rewrite rules to only when supported_post_types change. See #953. Props philipjohn, westonruter.
Fix AMP preview icon in Firefox. See #920. Props zigasancin.

0.6.1 (2018-02-09)

Version bump to re-release plugin in order to deal with missing file in 0.6.0 release package that caused fatal error.

0.6.0 (2018-01-23)

Add support for the "page" post type. A new page.php is introduced with template parts factored out (html-start.php, header.php, footer.php, html-end.php) and re-used from single.php. Note that AMP URLs will end in ?amp instead of /amp/. See #825. Props technosailor, ThierryA, westonruter.
Add AMP post preview button alongside non-AMP preview button. See #813. Props ThierryA, westonruter.
Add ability to disable AMP on a per-post basis via toggle in publish metabox. See #813. Props ThierryA, westonruter.
Add AMP settings admin screen for managing which post types have AMP support, eliminating the requirement to add add_post_type_support() calls in theme or plugin. See #811. Props ThierryA, westonruter.
Add generator meta tag for AMP. See #810. Props vaporwavre.
Add code quality checking via phpcs, eslint, jscs, and jshint. See #795. Props westonruter.
Add autoloader to reduce complexity. See #828. Props mikeschinkel, westonruter, ThierryA.
Fix Polldaddy amd SoundCloud embeds. Add vanilla WordPress "embed" test page. A new bin/create-embed-test-post.php WP-CLI script is introduced. See #829. Props kienstra, westonruter, ThierryA.
Merge AMP Customizer into main Customizer. See #819. Props kaitnyl, westonruter.
Update AMP HTML tags and attributes. A new bin/amphtml-update.sh bash script is introduced. Fixes Playbuzz. See #823. Props kienstra, ThierryA, westonruter.
Remove erroneous hash from id on amp-wp-header. See #853. Props eshannon3.

See 0.6 milestone.

0.5.1 (2017-08-17)

Fix: issues with invalid tags not being stripped out (e.g. script tags) (h/t tmmbecker, fahmi182, pppdog, seejacobscott, RavanH, jenniejj, lkraav, simonrperry for the reports).
Fix: issues with dimension extraction for protocol-less and relative URLs (h/t ktmn for the report).

0.5 (2017-08-04)

Whitelist Sanitizer: Replace Blacklist Sanitizer with a whitelist-based approach using the AMP spec (props delputnam)
Image Dimensions: Replace fastimage with fasterimage for PHP 5.4+. Enables faster downloads and wider support (props gititon)
Embed Handlers: Added support for Vimeo, SoundCloud, Pinterest (props amedina) and PlayBuzz (props lysk88)
Analytics: UI for easier addition of analytics tags (props amedina)
Fix: parse query strings properly (props amyevans)
Fix: Old slug redirect for AMP URLs (props rahulsprajapati)
Fix: Handle issues with data uri images in CSS (props trepmal)
Fix: Add amp-video js for amp-video tags (props ptbello)
Fix: Output CSS for feature image (props mjangda)
Fix: Fix attribute when adding AMP Mustache lib (props luigitec)
Fix: Various documentation updates (props piersb, bhhaskin)
Fix: PHP Warnings from register_customizer_ui (props jahvi)
Fix: Coding Standards (props paulschreiber)

0.4.2 (2016-10-13)

Fix: Prevent validation errors for html tag (h/t Maxime2 and everyone else that reported this error)
Fix: Handle variable name conflict that was causing content_max_width to be ignored (h/t mimancillas)
Fix: Prevent errors when nodes don't have attributes (h/t stephenmax)
Fix: Back-compat for 4.5 (add sanitize_hex_color function, h/t xotihcan)
Fix: Handle gif featured images (h/t protocolil)
Documentation updates (props troyxmccall)

0.4.1 (2016-10-10)

Fix: Don't fire the_content for featured image output
Fix: Don't show comment link when disabled and no comments on post (h/t neotrope)
Fix: strip !important from inline styles (h/t compointdesigner and enriccardonagmailcom)

0.4 (2016-10-06)

New template: spiffy, shiny, and has the fresh theme smell (props allancole and the Automattic Theme Team).
Warning: The template update has potential breaking changes. Please see https://wordpress.org/support/topic/v0-4-whats-new-and-possible-breaking-changes/
AMP Customizer: Pick your colors and make the template your own (props DrewAPicture and 10up)
Fix: support for inline styles (props coreymckrill).
Fix: no more fatal errors when tags not supported by post type (props david-binda)
Fix: no more unnecessary <br> tags.
Fix: sanitize children of removed nodes (like empty <a> tags) (props Maxime2).
Fix: no more broken YouTube URLs with multiple ?s.
Fix: properly handle tel and sms schemes (h/t soundstrategies).
Fix: remove amp endpoint on deactivate.
New filter: amp_pre_get_permalink if you want a completely custom AMP permalink.

0.3.3 (Aug 18, 2016)

Handle many more validation errors (props bcampeau and alleyinteractive).
New filter: amp_post_template_dir (props mustafauysal).
New template: Nav bar is now it's own template part (props jdevalk).
Better ratio for YouTube embeds.
Fix: better timezone handling (props rinatkhaziev).
Fix: better handling of non-int dimensions (like 100%).
Fix: better handling of empty dimensions.
Fix: autoplay is a bool-like value.
Fix: breakage when using the query_string hook (h/t mkuplens).
Fix: don't break really large Twitter IDs.
Fix: don't break Instagram shortcodes when using URLs with querystrings.
Readme improvements (props nickjohnford, sotayamashita)

0.3.2 (Mar 4, 2016)

Jetpack Stats support.
Better version of Merriweather and use system fonts for sans-serif (props mattmiklic).
Move font to stylesheet so it can be more easily overridden (props mattmiklic).
Fix: Template loading issues on Windows. (Thanks to everyone who reported this, especially w33zy for pointing out the validate_file issue.)
Fix: don't run AMP on post comment feeds (props kraftbj).
Fix: un-break pagination when using a static home page with multiple pages.
Fix: force amp-iframe to use https to validate correctly (props mister-ben).
Fix: validation for target and video/audio attributes.
Fix: clipped images in galleries (thanks tobaco).

0.3.1 (Feb 24, 2016)

Allow custom query var (props vaurdan).
Fix AMP URLs for non-pretty permalinks (props rakuishi).
Fix for password-protected posts.
Fix dimension extraction for schema-less or relative image URLs.
Better fallback for images with no dimensions.
Validation fixes for a tags (props kraftbj).
Updated AMP boilerplate.
Allow on tags for elements (props Steven Evatt).
Prefixed class names.

0.3 (Feb 18, 2016)

Fetch dimensions for hotlinked images.
Add amp-facebook support.
Add some new actions and filters (e.g. amp_init).
Fix validation errors for [gallery] shortcodes.
Fix issues with path validation on Windows.
Fix issues with really squeezed layout.
Breaking change: style.css no longer contains the `<style> tag. If you have a custom stylesheet, you need to update it to remove the tag.
Breaking change: single.php no longer includes the AMP boilerplate styles. They are instead added via the amp_post_template_head hook. If you have a custom template, please remove the boilerplate styles.

0.2 (Jan 28, 2016)

Lots and lots and lots of compatibility and validation fixes
Lots and lots and lots of improvements for customization

0.1

Initial version

Upgrade Notice

0.4

Breaking change: The new template has changes to markup, class names, and styles that may not work with existing customizations. If you want to stay on the old template for now, you can use the following code snippet:

if ( function_exists( 'amp_backcompat_use_v03_templates' ) ) {
	amp_backcompat_use_v03_templates();
}

For more details, please see https://wordpress.org/support/topic/v0-4-whats-new-and-possible-breaking-changes/

0.3.1

Breaking change: AMP_QUERY_VAR is now defined right before amp_init.
Breaking change: class names for elements in the default template were prefixed with amp-wp-. Any styles targeting these classes should be updated.

0.3

Breaking change: style.css no longer contains the `<style> tag. If you have a custom stylesheet, you need to update it to remove the tag.
Breaking change: single.php no longer includes the AMP boilerplate styles. They are instead added via the amp_post_template_head hook. If you have a custom template, please remove the boilerplate styles.

humanmade / amp

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