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					'xml:lang' => array(),
					'xml:space' => array(),
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					'cellpadding' => array(),
					'cellspacing' => array(),
					'sortable' => array(),
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						'form div [submitting][template]',
						'form div [verify-error][template]',
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					'mandatory_ancestor' => 'body',
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							'unique' => false,
						),
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							'mandatory' => false,
							'unique' => false,
						),
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					'requires_extension' => array(
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					'spec_name' => 'amp-story-auto-ads > template',
				),
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					'clip-rule' => array(),
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					'color-rendering' => array(),
					'cursor' => array(),
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					'fill' => array(),
					'fill-opacity' => array(),
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					'flood-opacity' => array(),
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					'requiredfeatures' => array(),
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					'text-anchor' => array(),
					'text-decoration' => array(),
					'text-rendering' => array(),
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					'vector-effect' => array(),
					'visibility' => array(),
					'word-spacing' => array(),
					'writing-mode' => array(),
					'x' => array(),
					'xml:lang' => array(),
					'xml:space' => array(),
					'xmlns' => array(),
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					'spec_url' => 'https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#svg',
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					'autoexpand' => array(
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					'autofocus' => array(),
					'cols' => array(),
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					'data-amp-bind-autofocus' => array(),
					'data-amp-bind-cols' => array(),
					'data-amp-bind-defaulttext' => array(),
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					'data-amp-bind-minlength' => array(),
					'data-amp-bind-pattern' => array(),
					'data-amp-bind-placeholder' => array(),
					'data-amp-bind-readonly' => array(),
					'data-amp-bind-required' => array(),
					'data-amp-bind-rows' => array(),
					'data-amp-bind-selectiondirection' => array(),
					'data-amp-bind-selectionend' => array(),
					'data-amp-bind-selectionstart' => array(),
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					'spellcheck' => array(),
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				'tag_spec' => array(
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					'xlink:actuate' => array(),
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							'protocol' => array(
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								'https',
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						),
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					'xlink:show' => array(),
					'xlink:title' => array(),
					'xlink:type' => array(),
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				'tag_spec' => array(),
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			),
		),
		'vkern' => array(
			array(
				'attr_spec_list' => array(
					'g1' => array(),
					'g2' => array(),
					'k' => array(),
					'style' => array(),
					'u1' => array(),
					'u2' => array(),
					'xml:lang' => array(),
					'xml:space' => array(),
					'xmlns' => array(),
					'xmlns:xlink' => array(),
				),
				'tag_spec' => array(
					'mandatory_ancestor' => 'svg',
					'spec_url' => 'https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#svg',
				),
			),
		),
		'wbr' => array(
			array(
				'attr_spec_list' => array(),
				'tag_spec' => array(),
			),
		),
	);

	private static $layout_allowed_attrs = array(
		'data-amp-bind-height' => array(),
		'data-amp-bind-width' => array(),
		'disable-inline-width' => array(),
		'height' => array(),
		'heights' => array(),
		'layout' => array(),
		'sizes' => array(),
		'width' => array(),
	);


	private static $globally_allowed_attrs = array(
		'about' => array(),
		'accesskey' => array(),
		'amp-access' => array(),
		'amp-access-behavior' => array(),
		'amp-access-hide' => array(),
		'amp-access-id' => array(),
		'amp-access-loader' => array(),
		'amp-access-loading' => array(),
		'amp-access-off' => array(),
		'amp-access-on' => array(),
		'amp-access-show' => array(),
		'amp-access-style' => array(),
		'amp-access-template' => array(),
		'amp-fx' => array(
			'requires_extension' => array(
				'amp-fx-collection',
			),
			'value_regex_casei' => '(fade-in|fade-in-scroll|float-in-bottom|float-in-top|fly-in-bottom|fly-in-left|fly-in-right|fly-in-top|parallax)(\\s|fade-in|fade-in-scroll|float-in-bottom|float-in-top|fly-in-bottom|fly-in-left|fly-in-right|fly-in-top|parallax)*',
		),
		'aria-activedescendant' => array(),
		'aria-atomic' => array(),
		'aria-autocomplete' => array(),
		'aria-busy' => array(),
		'aria-checked' => array(),
		'aria-controls' => array(),
		'aria-current' => array(),
		'aria-describedby' => array(),
		'aria-disabled' => array(),
		'aria-dropeffect' => array(),
		'aria-expanded' => array(),
		'aria-flowto' => array(),
		'aria-grabbed' => array(),
		'aria-haspopup' => array(),
		'aria-hidden' => array(),
		'aria-invalid' => array(),
		'aria-label' => array(),
		'aria-labelledby' => array(),
		'aria-level' => array(),
		'aria-live' => array(),
		'aria-multiline' => array(),
		'aria-multiselectable' => array(),
		'aria-orientation' => array(),
		'aria-owns' => array(),
		'aria-posinset' => array(),
		'aria-pressed' => array(),
		'aria-readonly' => array(),
		'aria-relevant' => array(),
		'aria-required' => array(),
		'aria-selected' => array(),
		'aria-setsize' => array(),
		'aria-sort' => array(),
		'aria-valuemax' => array(),
		'aria-valuemin' => array(),
		'aria-valuenow' => array(),
		'aria-valuetext' => array(),
		'autoscroll' => array(),
		'class' => array(),
		'content' => array(),
		'data-amp-bind-aria-activedescendant' => array(),
		'data-amp-bind-aria-atomic' => array(),
		'data-amp-bind-aria-autocomplete' => array(),
		'data-amp-bind-aria-busy' => array(),
		'data-amp-bind-aria-checked' => array(),
		'data-amp-bind-aria-controls' => array(),
		'data-amp-bind-aria-describedby' => array(),
		'data-amp-bind-aria-disabled' => array(),
		'data-amp-bind-aria-dropeffect' => array(),
		'data-amp-bind-aria-expanded' => array(),
		'data-amp-bind-aria-flowto' => array(),
		'data-amp-bind-aria-grabbed' => array(),
		'data-amp-bind-aria-haspopup' => array(),
		'data-amp-bind-aria-hidden' => array(),
		'data-amp-bind-aria-invalid' => array(),
		'data-amp-bind-aria-label' => array(),
		'data-amp-bind-aria-labelledby' => array(),
		'data-amp-bind-aria-level' => array(),
		'data-amp-bind-aria-live' => array(),
		'data-amp-bind-aria-multiline' => array(),
		'data-amp-bind-aria-multiselectable' => array(),
		'data-amp-bind-aria-orientation' => array(),
		'data-amp-bind-aria-owns' => array(),
		'data-amp-bind-aria-posinset' => array(),
		'data-amp-bind-aria-pressed' => array(),
		'data-amp-bind-aria-readonly' => array(),
		'data-amp-bind-aria-relevant' => array(),
		'data-amp-bind-aria-required' => array(),
		'data-amp-bind-aria-selected' => array(),
		'data-amp-bind-aria-setsize' => array(),
		'data-amp-bind-aria-sort' => array(),
		'data-amp-bind-aria-valuemax' => array(),
		'data-amp-bind-aria-valuemin' => array(),
		'data-amp-bind-aria-valuenow' => array(),
		'data-amp-bind-aria-valuetext' => array(),
		'data-amp-bind-class' => array(),
		'data-amp-bind-hidden' => array(),
		'data-amp-bind-text' => array(),
		'datatype' => array(),
		'dir' => array(),
		'draggable' => array(),
		'fallback' => array(
			'value' => array(
				'',
			),
		),
		'hidden' => array(
			'value' => array(
				'',
			),
		),
		'i-amp-access-id' => array(),
		'id' => array(
			'disallowed_value_regex' => '(^|\\s)(__amp_\\S*|__count__|__defineGetter__|__defineSetter__|__lookupGetter__|__lookupSetter__|__noSuchMethod__|__parent__|__proto__|__AMP_\\S*|\\$p|\\$proxy|acceptCharset|addEventListener|appendChild|assignedSlot|attachShadow|AMP|baseURI|checkValidity|childElementCount|childNodes|classList|className|clientHeight|clientLeft|clientTop|clientWidth|compareDocumentPosition|computedName|computedRole|contentEditable|createShadowRoot|enqueAction|firstChild|firstElementChild|getAnimations|getAttribute|getAttributeNS|getAttributeNode|getAttributeNodeNS|getBoundingClientRect|getClientRects|getDestinationInsertionPoints|getElementsByClassName|getElementsByTagName|getElementsByTagNameNS|getRootNode|hasAttribute|hasAttributeNS|hasAttributes|hasChildNodes|hasPointerCapture|i-amphtml-\\S*|innerHTML|innerText|inputMode|insertAdjacentElement|insertAdjacentHTML|insertAdjacentText|isContentEditable|isDefaultNamespace|isEqualNode|isSameNode|lastChild|lastElementChild|lookupNamespaceURI|namespaceURI|nextElementSibling|nextSibling|nodeName|nodeType|nodeValue|offsetHeight|offsetLeft|offsetParent|offsetTop|offsetWidth|outerHTML|outerText|ownerDocument|parentElement|parentNode|previousElementSibling|previousSibling|querySelector|querySelectorAll|releasePointerCapture|removeAttribute|removeAttributeNS|removeAttributeNode|removeChild|removeEventListener|replaceChild|reportValidity|requestPointerLock|scrollHeight|scrollIntoView|scrollIntoViewIfNeeded|scrollLeft|scrollWidth|setAttribute|setAttributeNS|setAttributeNode|setAttributeNodeNS|setPointerCapture|shadowRoot|styleMap|tabIndex|tagName|textContent|toString|valueOf|(webkit|ms|moz|o)dropzone|(webkit|moz|ms|o)MatchesSelector|(webkit|moz|ms|o)RequestFullScreen|(webkit|moz|ms|o)RequestFullscreen)(\\s|$)',
		),
		'inlist' => array(),
		'itemid' => array(),
		'itemprop' => array(),
		'itemref' => array(),
		'itemscope' => array(),
		'itemtype' => array(),
		'lang' => array(),
		'next-page-hide' => array(
			'requires_extension' => array(
				'amp-next-page',
			),
		),
		'next-page-replace' => array(
			'requires_extension' => array(
				'amp-next-page',
			),
		),
		'on' => array(),
		'overflow' => array(),
		'placeholder' => array(
			'value' => array(
				'',
			),
		),
		'prefix' => array(),
		'property' => array(),
		'rel' => array(
			'disallowed_value_regex' => '(^|\\s)(canonical|components|dns-prefetch|import|manifest|preconnect|preload|prerender|serviceworker|stylesheet|subresource)(\\s|$)',
		),
		'resource' => array(),
		'rev' => array(),
		'role' => array(),
		'slot' => array(),
		'style' => array(),
		'subscriptions-action' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
		),
		'subscriptions-actions' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
			'value' => array(
				'',
			),
		),
		'subscriptions-decorate' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
		),
		'subscriptions-dialog' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
			'value' => array(
				'',
			),
		),
		'subscriptions-display' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
		),
		'subscriptions-google-rtc' => array(
			'requires_extension' => array(
				'amp-subscriptions-google',
			),
		),
		'subscriptions-lang' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
		),
		'subscriptions-section' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
			'value_casei' => array(
				'actions',
				'content',
				'content-not-granted',
				'loading',
			),
		),
		'subscriptions-service' => array(
			'requires_extension' => array(
				'amp-subscriptions',
			),
		),
		'tabindex' => array(),
		'title' => array(),
		'translate' => array(),
		'typeof' => array(),
		'validation-for' => array(),
		'visible-when-invalid' => array(
			'value' => array(
				'badInput',
				'customError',
				'patternMismatch',
				'rangeOverflow',
				'rangeUnderflow',
				'stepMismatch',
				'tooLong',
				'tooShort',
				'typeMismatch',
				'valueMissing',
			),
		),
		'vocab' => array(),
	);


	private static $reference_points = array(
		'AMP-BASE-CAROUSEL lightbox [child]' => array(
			'attr_spec_list' => array(
				'lightbox-thumbnail-id' => array(
					'value_regex_casei' => '^[a-z][a-z\\d_-]*',
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-BASE-CAROUSEL lightbox [child]',
			),
		),
		'AMP-BASE-CAROUSEL lightbox [lightbox-exclude]' => array(
			'attr_spec_list' => array(
				'lightbox-exclude' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-BASE-CAROUSEL lightbox [lightbox-exclude]',
			),
		),
		'AMP-CAROUSEL lightbox [child]' => array(
			'attr_spec_list' => array(
				'lightbox-thumbnail-id' => array(
					'value_regex_casei' => '^[a-z][a-z\\d_-]*',
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-CAROUSEL lightbox [child]',
			),
		),
		'AMP-CAROUSEL lightbox [lightbox-exclude]' => array(
			'attr_spec_list' => array(
				'lightbox-exclude' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-CAROUSEL lightbox [lightbox-exclude]',
			),
		),
		'AMP-LIVE-LIST [items]' => array(
			'attr_spec_list' => array(
				'items' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'reference_points' => array(
					'AMP-LIVE-LIST [items] item' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-LIVE-LIST [items]',
				'spec_url' => 'https://amp.dev/documentation/components/amp-live-list/#items',
			),
		),
		'AMP-LIVE-LIST [items] item' => array(
			'attr_spec_list' => array(
				'data-sort-time' => array(
					'mandatory' => true,
				),
				'data-tombstone' => array(),
				'data-update-time' => array(),
				'id' => array(
					'disallowed_value_regex' => '(^|\\s)(__amp_\\S*|__count__|__defineGetter__|__defineSetter__|__lookupGetter__|__lookupSetter__|__noSuchMethod__|__parent__|__proto__|__AMP_\\S*|\\$p|\\$proxy|acceptCharset|addEventListener|appendChild|assignedSlot|attachShadow|AMP|baseURI|checkValidity|childElementCount|childNodes|classList|className|clientHeight|clientLeft|clientTop|clientWidth|compareDocumentPosition|computedName|computedRole|contentEditable|createShadowRoot|enqueAction|firstChild|firstElementChild|getAnimations|getAttribute|getAttributeNS|getAttributeNode|getAttributeNodeNS|getBoundingClientRect|getClientRects|getDestinationInsertionPoints|getElementsByClassName|getElementsByTagName|getElementsByTagNameNS|getRootNode|hasAttribute|hasAttributeNS|hasAttributes|hasChildNodes|hasPointerCapture|i-amphtml-\\S*|innerHTML|innerText|inputMode|insertAdjacentElement|insertAdjacentHTML|insertAdjacentText|isContentEditable|isDefaultNamespace|isEqualNode|isSameNode|lastChild|lastElementChild|lookupNamespaceURI|namespaceURI|nextElementSibling|nextSibling|nodeName|nodeType|nodeValue|offsetHeight|offsetLeft|offsetParent|offsetTop|offsetWidth|outerHTML|outerText|ownerDocument|parentElement|parentNode|previousElementSibling|previousSibling|querySelector|querySelectorAll|releasePointerCapture|removeAttribute|removeAttributeNS|removeAttributeNode|removeChild|removeEventListener|replaceChild|reportValidity|requestPointerLock|scrollHeight|scrollIntoView|scrollIntoViewIfNeeded|scrollLeft|scrollWidth|setAttribute|setAttributeNS|setAttributeNode|setAttributeNodeNS|setPointerCapture|shadowRoot|styleMap|tabIndex|tagName|textContent|toString|valueOf|(webkit|ms|moz|o)dropzone|(webkit|moz|ms|o)MatchesSelector|(webkit|moz|ms|o)RequestFullScreen|(webkit|moz|ms|o)RequestFullscreen)(\\s|$)',
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-LIVE-LIST [items] item',
				'spec_url' => 'https://amp.dev/documentation/components/amp-live-list/#items',
			),
		),
		'AMP-LIVE-LIST [pagination]' => array(
			'attr_spec_list' => array(
				'pagination' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-LIVE-LIST [pagination]',
				'spec_url' => 'https://amp.dev/documentation/components/amp-live-list/#pagination',
			),
		),
		'AMP-LIVE-LIST [update]' => array(
			'attr_spec_list' => array(
				'update' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-LIVE-LIST [update]',
				'spec_url' => 'https://amp.dev/documentation/components/amp-live-list/#update',
			),
		),
		'AMP-MEGA-MENU > AMP-LIST' => array(
			'attr_spec_list' => array(
				'data-amp-bind-src' => array(),
				'src' => array(),
			),
			'tag_spec' => array(
				'child_tags' => array(
					'child_tag_name_oneof' => array(
						'template',
					),
					'mandatory_num_child_tags' => 1,
				),
				'mandatory_anyof' => array(
					'data-amp-bind-src',
					'src',
				),
				'reference_points' => array(
					'AMP-MEGA-MENU > AMP-LIST > TEMPLATE' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-MEGA-MENU > AMP-LIST',
			),
		),
		'AMP-MEGA-MENU > AMP-LIST > TEMPLATE' => array(
			'attr_spec_list' => array(),
			'tag_spec' => array(
				'child_tags' => array(
					'child_tag_name_oneof' => array(
						'nav',
					),
					'mandatory_num_child_tags' => 1,
				),
				'mandatory_parent' => 'amp-list',
				'reference_points' => array(
					'AMP-MEGA-MENU > NAV' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-MEGA-MENU > AMP-LIST > TEMPLATE',
			),
		),
		'AMP-MEGA-MENU > NAV' => array(
			'attr_spec_list' => array(),
			'tag_spec' => array(
				'child_tags' => array(
					'child_tag_name_oneof' => array(
						'ol',
						'ul',
					),
					'mandatory_num_child_tags' => 1,
				),
				'reference_points' => array(
					'AMP-MEGA-MENU NAV > UL/OL' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-MEGA-MENU > NAV',
			),
		),
		'AMP-MEGA-MENU NAV > UL/OL' => array(
			'attr_spec_list' => array(),
			'tag_spec' => array(
				'child_tags' => array(
					'child_tag_name_oneof' => array(
						'li',
					),
					'mandatory_min_num_child_tags' => 1,
				),
				'mandatory_parent' => 'nav',
				'reference_points' => array(
					'AMP-MEGA-MENU NAV > UL/OL > LI' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-MEGA-MENU NAV > UL/OL',
			),
		),
		'AMP-MEGA-MENU NAV > UL/OL > LI' => array(
			'attr_spec_list' => array(),
			'tag_spec' => array(
				'child_tags' => array(
					'child_tag_name_oneof' => array(
						'a',
						'button',
						'div',
						'h1',
						'h2',
						'h3',
						'h4',
						'h5',
						'h6',
						'span',
					),
					'mandatory_min_num_child_tags' => 1,
				),
				'reference_points' => array(
					'AMP-MEGA-MENU item-content' => array(
						'mandatory' => false,
						'unique' => true,
					),
					'AMP-MEGA-MENU item-heading' => array(
						'mandatory' => true,
						'unique' => true,
					),
				),
				'spec_name' => 'AMP-MEGA-MENU NAV > UL/OL > LI',
			),
		),
		'AMP-MEGA-MENU item-content' => array(
			'attr_spec_list' => array(
				'role' => array(
					'mandatory' => true,
					'value' => array(
						'dialog',
					),
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-MEGA-MENU item-content',
			),
		),
		'AMP-MEGA-MENU item-heading' => array(
			'attr_spec_list' => array(
				'role' => array(
					'value' => array(
						'button',
					),
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-MEGA-MENU item-heading',
			),
		),
		'AMP-NEXT-PAGE > [footer]' => array(
			'attr_spec_list' => array(
				'footer' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'mandatory_parent' => 'amp-next-page',
				'spec_name' => 'AMP-NEXT-PAGE > [footer]',
			),
		),
		'AMP-NEXT-PAGE > [recommendation-box]' => array(
			'attr_spec_list' => array(
				'recommendation-box' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'mandatory_parent' => 'amp-next-page',
				'spec_name' => 'AMP-NEXT-PAGE > [recommendation-box]',
			),
		),
		'AMP-NEXT-PAGE > [separator]' => array(
			'attr_spec_list' => array(
				'separator' => array(
					'mandatory' => true,
				),
			),
			'tag_spec' => array(
				'mandatory_parent' => 'amp-next-page',
				'spec_name' => 'AMP-NEXT-PAGE > [separator]',
			),
		),
		'AMP-SELECTOR child' => array(
			'attr_spec_list' => array(),
			'tag_spec' => array(
				'reference_points' => array(
					'AMP-SELECTOR child' => array(
						'mandatory' => false,
						'unique' => false,
					),
					'AMP-SELECTOR option' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-SELECTOR child',
			),
		),
		'AMP-SELECTOR option' => array(
			'attr_spec_list' => array(
				'disabled' => array(
					'value' => array(
						'',
					),
				),
				'option' => array(
					'mandatory' => true,
				),
				'selected' => array(
					'value' => array(
						'',
					),
				),
			),
			'tag_spec' => array(
				'spec_name' => 'AMP-SELECTOR option',
				'spec_url' => 'https://amp.dev/documentation/components/amp-selector/',
			),
		),
		'AMP-STORY-CTA-LAYER animate-in' => array(
			'attr_spec_list' => array(
				'animate-in' => array(
					'value' => array(
						'drop',
						'fade-in',
						'fly-in-bottom',
						'fly-in-left',
						'fly-in-right',
						'fly-in-top',
						'pan-down',
						'pan-left',
						'pan-right',
						'pan-up',
						'pulse',
						'rotate-in-left',
						'rotate-in-right',
						'scale-fade-down',
						'scale-fade-up',
						'twirl-in',
						'whoosh-in-left',
						'whoosh-in-right',
						'zoom-in',
						'zoom-out',
					),
				),
				'animate-in-after' => array(),
				'animate-in-delay' => array(),
				'animate-in-duration' => array(),
				'animate-in-timing-function' => array(),
				'scale-end' => array(
					'value_regex' => '[0-9]+([.][0-9]+)?',
				),
				'scale-start' => array(
					'value_regex' => '[0-9]+([.][0-9]+)?',
				),
				'translate-x' => array(
					'value_regex_casei' => '[0-9]+px',
				),
				'translate-y' => array(
					'value_regex_casei' => '[0-9]+px',
				),
			),
			'tag_spec' => array(
				'reference_points' => array(
					'AMP-STORY-CTA-LAYER animate-in' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-STORY-CTA-LAYER animate-in',
				'spec_url' => 'https://amp.dev/documentation/components/amp-story/',
			),
		),
		'AMP-STORY-GRID-LAYER animate-in' => array(
			'attr_spec_list' => array(
				'animate-in' => array(
					'value' => array(
						'drop',
						'fade-in',
						'fly-in-bottom',
						'fly-in-left',
						'fly-in-right',
						'fly-in-top',
						'pan-down',
						'pan-left',
						'pan-right',
						'pan-up',
						'pulse',
						'rotate-in-left',
						'rotate-in-right',
						'scale-fade-down',
						'scale-fade-up',
						'twirl-in',
						'whoosh-in-left',
						'whoosh-in-right',
						'zoom-in',
						'zoom-out',
					),
				),
				'animate-in-after' => array(),
				'animate-in-delay' => array(),
				'animate-in-duration' => array(),
				'animate-in-timing-function' => array(),
				'data-tooltip-icon' => array(
					'value_url' => array(
						'protocol' => array(
							'http',
							'https',
							'data',
						),
					),
				),
				'interactive' => array(
					'value' => array(
						'',
					),
				),
				'scale-end' => array(
					'value_regex' => '[0-9]+([.][0-9]+)?',
				),
				'scale-start' => array(
					'value_regex' => '[0-9]+([.][0-9]+)?',
				),
				'target' => array(
					'value' => array(
						'_blank',
					),
				),
				'translate-x' => array(
					'value_regex_casei' => '[0-9]+px',
				),
				'translate-y' => array(
					'value_regex_casei' => '[0-9]+px',
				),
			),
			'tag_spec' => array(
				'reference_points' => array(
					'AMP-STORY-GRID-LAYER animate-in' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-STORY-GRID-LAYER animate-in',
				'spec_url' => 'https://amp.dev/documentation/components/amp-story/',
			),
		),
		'AMP-STORY-GRID-LAYER default' => array(
			'attr_spec_list' => array(
				'align-content' => array(
					'value' => array(
						'center',
						'end',
						'space-around',
						'space-between',
						'space-evenly',
						'start',
						'stretch',
					),
				),
				'align-items' => array(
					'value' => array(
						'center',
						'end',
						'start',
						'stretch',
					),
				),
				'align-self' => array(
					'value' => array(
						'center',
						'end',
						'start',
						'stretch',
					),
				),
				'animate-in' => array(
					'value' => array(
						'drop',
						'fade-in',
						'fly-in-bottom',
						'fly-in-left',
						'fly-in-right',
						'fly-in-top',
						'pan-down',
						'pan-left',
						'pan-right',
						'pan-up',
						'pulse',
						'rotate-in-left',
						'rotate-in-right',
						'scale-fade-down',
						'scale-fade-up',
						'twirl-in',
						'whoosh-in-left',
						'whoosh-in-right',
						'zoom-in',
						'zoom-out',
					),
				),
				'animate-in-after' => array(),
				'animate-in-delay' => array(),
				'animate-in-duration' => array(),
				'animate-in-timing-function' => array(),
				'data-tooltip-icon' => array(
					'value_url' => array(
						'protocol' => array(
							'http',
							'https',
							'data',
						),
					),
				),
				'grid-area' => array(),
				'interactive' => array(
					'value' => array(
						'',
					),
				),
				'justify-content' => array(
					'value' => array(
						'center',
						'end',
						'space-around',
						'space-between',
						'space-evenly',
						'start',
						'stretch',
					),
				),
				'justify-items' => array(
					'value' => array(
						'center',
						'end',
						'start',
						'stretch',
					),
				),
				'justify-self' => array(
					'value' => array(
						'center',
						'end',
						'start',
						'stretch',
					),
				),
				'scale-end' => array(
					'value_regex' => '[0-9]+([.][0-9]+)?',
				),
				'scale-start' => array(
					'value_regex' => '[0-9]+([.][0-9]+)?',
				),
				'target' => array(
					'value' => array(
						'_blank',
					),
				),
				'translate-x' => array(
					'value_regex_casei' => '[0-9]+px',
				),
				'translate-y' => array(
					'value_regex_casei' => '[0-9]+px',
				),
			),
			'tag_spec' => array(
				'reference_points' => array(
					'AMP-STORY-GRID-LAYER animate-in' => array(
						'mandatory' => false,
						'unique' => false,
					),
				),
				'spec_name' => 'AMP-STORY-GRID-LAYER default',
				'spec_url' => 'https://amp.dev/documentation/components/amp-story/',
			),
		),
	);


	/**
	 * Get allowed tags.
	 *
	 * @since 0.5
	 * @return array Allowed tags.
	 */
	public static function get_allowed_tags() {
		return self::$allowed_tags;
	}

	/**
	 * Get extension specs.
	 *
	 * @since 1.5
	 * @internal
	 * @return array Extension specs, keyed by extension name.
	 */
	public static function get_extension_specs() {
		static $extension_specs = [];

		if ( ! empty( $extension_specs ) ) {
			return $extension_specs;
		}

		foreach ( self::get_allowed_tag( 'script' ) as $script_spec ) {
			if ( isset( $script_spec[ AMP_Rule_Spec::TAG_SPEC ]['extension_spec'] ) ) {
				$extension_specs[ $script_spec[ AMP_Rule_Spec::TAG_SPEC ]['extension_spec']['name'] ] = $script_spec[ AMP_Rule_Spec::TAG_SPEC ]['extension_spec'];
			}
		}

		return $extension_specs;
	}

	/**
	 * Get allowed tag.
	 *
	 * Get the rules for a single tag so that the entire data structure needn't be passed around.
	 *
	 * @since 0.7
	 * @param string $node_name Tag name.
	 * @return array|null Allowed tag, or null if the tag does not exist.
	 */
	public static function get_allowed_tag( $node_name ) {
		if ( isset( self::$allowed_tags[ $node_name ] ) ) {
			return self::$allowed_tags[ $node_name ];
		}
		return null;
	}

	/**
	 * Get descendant tag lists.
	 *
	 * @since 1.1
	 * @return array Descendant tags list.
	 */
	public static function get_descendant_tag_lists() {
		return self::$descendant_tag_lists;
	}

	/**
	 * Get allowed descendant tag list for a tag.
	 *
	 * Get the descendant rules for a single tag so that the entire data structure needn't be passed around.
	 *
	 * @since 1.1
	 * @param string $name Name for the descendants list.
	 * @return array|bool Allowed tags list, or false if there are no restrictions.
	 */
	public static function get_descendant_tag_list( $name ) {
		if ( isset( self::$descendant_tag_lists[ $name ] ) ) {
			return self::$descendant_tag_lists[ $name ];
		}
		return false;
	}

	/**
	 * Get reference point spec.
	 *
	 * @since 1.0
	 * @param string $tag_spec_name Tag spec name.
	 * @return array|null Reference point spec, or null if does not exist.
	 */
	public static function get_reference_point_spec( $tag_spec_name ) {
		if ( isset( self::$reference_points[ $tag_spec_name ] ) ) {
			return self::$reference_points[ $tag_spec_name ];
		}
		return null;
	}

	/**
	 * Get list of globally-allowed attributes.
	 *
	 * @since 0.5
	 * @return array Allowed tag.
	 */
	public static function get_allowed_attributes() {
		return self::$globally_allowed_attrs;
	}

	/**
	 * Get layout attributes.
	 *
	 * @since 0.5
	 * @return array Allowed tag.
	 */
	public static function get_layout_attributes() {
		return self::$layout_allowed_attrs;
	}

}