<?php

namespace AmpProject\Html;

/**
 * Interface with constants for the different "at" rules.
 *
 * @package ampproject/amp-toolbox
 */
interface AtRule
{
    const _MOZ_DOCUMENT       = '-moz-document';
    const CHARSET             = 'charset';
    const COUNTER_STYLE       = 'counter-style';
    const DOCUMENT            = 'document';
    const FONT_FACE           = 'font-face';
    const FONT_FEATURE_VALUES = 'font-feature-values';
    const IMPORT              = 'import';
    const KEYFRAMES           = 'keyframes';
    const MEDIA               = 'media';
    const NAMESPACE_          = 'namespace';
    const PAGE                = 'page';
    const PROPERTY            = 'property';
    const SUPPORTS            = 'supports';
    const VIEWPORT            = 'viewport';
}