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<?php
namespace AmpProject;
/**
* Interface with constants for the different types of tags.
*
* @package ampproject/common
*/
interface Tag
{
const A = 'a';
const AREA = 'area';
const BASE = 'base';
const BASEFONT = 'basefont';
const BGSOUND = 'bgsound';
const BODY = 'body';
const BR = 'br';
const COL = 'col';
const EMBED = 'embed';
const FIGCAPTION = 'figcaption';
const FIGURE = 'figure';
const FORM = 'form';
const FRAME = 'frame';
const HEAD = 'head';
const HR = 'hr';
const HTML = 'html';
const IMG = 'img';
const INPUT = 'input';
const KEYGEN = 'keygen';
const LINK = 'link';
const META = 'meta';
const NOSCRIPT = 'noscript';
const PARAM = 'param';
const SCRIPT = 'script';
const SOURCE = 'source';
const STYLE = 'style';
const TEMPLATE = 'template';
const TITLE = 'title';
const TRACK = 'track';
const WBR = 'wbr';
/**
* HTML elements that are self-closing.
*
* @link https://www.w3.org/TR/html5/syntax.html#serializing-html-fragments
*
* @var string[]
*/
const SELF_CLOSING_TAGS = [
self::AREA,
self::BASE,
self::BASEFONT,
self::BGSOUND,
self::BR,
self::COL,
self::EMBED,
self::FRAME,
self::HR,
self::IMG,
self::INPUT,
self::KEYGEN,
self::LINK,
self::META,
self::PARAM,
self::SOURCE,
self::TRACK,
self::WBR,
];
/**
* List of elements allowed in head.
*
* @link https://github.com/ampproject/amphtml/blob/445d6e3be8a5063e2738c6f90fdcd57f2b6208be/validator/engine/htmlparser.js#L83-L100
* @link https://www.w3.org/TR/html5/document-metadata.html
*
* @var string[]
*/
const ELEMENTS_ALLOWED_IN_HEAD = [
self::TITLE,
self::BASE,
self::LINK,
self::META,
self::STYLE,
self::NOSCRIPT,
self::SCRIPT,
];
}
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