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<?php
namespace AmpProject;
/**
* Interface with constants for the different types of attributes.
*
* @package ampproject/common
*/
interface Attribute
{
const ACTION = 'action';
const ALT = 'alt';
const AMP = 'amp';
const AMP4ADS = 'amp4ads';
const AMP4ADS_BOILERPLATE = 'amp4ads-boilerplate';
const AMP4ADS_EMOJI = self::AMP_EMOJI . '4ads';
const AMP4ADS_EMOJI_ALT = self::AMP_EMOJI_ALT . '4ads';
const AMP4EMAIL = 'amp4email';
const AMP4EMAIL_BOILERPLATE = 'amp4email-boilerplate';
const AMP4EMAIL_EMOJI = self::AMP_EMOJI . '4email';
const AMP4EMAIL_EMOJI_ALT = self::AMP_EMOJI_ALT . '4email';
const AMP_BOILERPLATE = 'amp-boilerplate';
const AMP_CUSTOM = 'amp-custom';
const AMP_EMOJI = "\xE2\x9A\xA1";
const AMP_EMOJI_ALT = "\xE2\x9A\xA1\xEF\xB8\x8F"; // See https://github.com/ampproject/amphtml/issues/25990.
const AMP_RUNTIME = 'amp-runtime';
const AMP_SCRIPT_SRC = 'amp-script-src';
const ARIA_HIDDEN = 'aria-hidden';
const ASYNC = 'async';
const AUTOPLAY = 'autoplay';
const CHARSET = 'charset';
const CLASS_ = 'class'; // Underscore needed because 'class' is a PHP keyword.
const CONTENT = 'content';
const CUSTOM_ELEMENT = 'custom-element';
const CUSTOM_TEMPLATE = 'custom-template';
const DECODING = 'decoding';
const DISABLE_INLINE_WIDTH = 'disable-inline-width';
const HEIGHT = 'height';
const HEIGHTS = 'heights';
const HIDDEN = 'hidden';
const HOST_SERVICE = 'host-service';
const HREF = 'href';
const HTTP_EQUIV = 'http-equiv';
const I_AMPHTML_VERSION = 'i-amphtml-version';
const ID = 'id';
const IMPORTANCE = 'importance';
const INTRINSICSIZE = 'intrinsicsize';
const LAYOUT = 'layout';
const LIGHTBOX = 'lightbox';
const LOADING = 'loading';
const LOOP = 'loop';
const MEDIA = 'media';
const NAME = 'name';
const NOLOADING = 'noloading';
const OBJECT_FIT = 'object-fit';
const ON = 'on';
const PROFILE = 'profile';
const REL = 'rel';
const ROLE = 'role';
const SRCSET = 'srcset';
const SIZES = 'sizes';
const STYLE = 'style';
const SRC = 'src';
const TABINDEX = 'tabindex';
const TEMPLATE = 'template';
const TITLE = 'title';
const TYPE = 'type';
const VALUE = 'value';
const VIEWPORT = 'viewport';
const WIDTH = 'width';
const ALL_AMP = [self::AMP, self::AMP_EMOJI, self::AMP_EMOJI_ALT];
const ALL_AMP4ADS = [self::AMP4ADS, self::AMP4ADS_EMOJI, self::AMP4ADS_EMOJI_ALT];
const ALL_AMP4EMAIL = [self::AMP4EMAIL, self::AMP4EMAIL_EMOJI, self::AMP4EMAIL_EMOJI_ALT];
const ALL_BOILERPLATES = [self::AMP_BOILERPLATE, self::AMP4ADS_BOILERPLATE, self::AMP4EMAIL_BOILERPLATE];
const TYPE_HTML = 'text/html';
const TYPE_JSON = 'application/json';
const TYPE_LD_JSON = 'application/ld+json';
const TYPE_TEXT_PLAIN = 'text/plain';
const REL_AMPHTML = 'amphtml';
const REL_CANONICAL = 'canonical';
const REL_DNS_PREFETCH = 'dns-prefetch';
const REL_ICON = 'icon';
const REL_NOAMPHTML = 'noamphtml';
const REL_NOFOLLOW = 'nofollow';
const REL_PRECONNECT = 'preconnect';
const REL_PREFETCH = 'prefetch';
const REL_PRELOAD = 'preload';
const REL_PRERENDER = 'prerender';
const REL_STYLESHEET = 'stylesheet';
}
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