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validator-main.protoascii
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#
# Copyright 2016 The AMP HTML Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the license.
#
# This revision id refers to the validator revision id, currently a Google
# internal mechanism. When backwards incompatible changes to the validator
# engine are made, this value must be incremented to prevent old binaries
# in production from crashing. This id is not relevant to validator.js
# because thus far, engine (validator.js) and spec file
# (validator-main.protoascii, etc) are always released together.
min_validator_revision_required: 475
# DEPRECATED: This value is no longer updated.
spec_file_revision: 1188
styles_spec_url: "https://amp.dev/documentation/guides-and-tutorials/develop/style_and_layout/style_pages/"
script_spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/validation-workflow/validation_errors/#custom-javascript-is-not-allowed"
# Validator extensions.
# =====================
# In addition to the rules in this file, the Validator honors the rules
# in the extensions/*/validator-*.protoascii files. This makes it
# easy to organize the rules for extensions next to their Javascript
# implementation.
# Rules for AMP HTML
# https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml
doc: {
html_format: AMP4EMAIL
max_bytes: 200000
max_bytes_spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/email-spec/amp-email-format/?format=email"
}
tags: {
html_format: AMP
html_format: AMP4EMAIL
tag_name: "!DOCTYPE"
spec_name: "html doctype"
descriptive_name: "html !doctype"
mandatory_parent: "$ROOT"
mandatory: true
unique: true
explicit_attrs_only: true
attrs: {
name: "html"
mandatory: true
value: ""
}
# `lang` is not supported per spec but is allowed because it has been observed
# on existing AMP documents.
attrs: {
name: "lang"
deprecation: "html"
deprecation_url: "https://github.com/ampproject/amphtml/issues/25926"
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
# AMP4ADS may need time to transition <!doctype> to using explicit attrs only.
# Tracking in b/123227526 to merge into tagspec with spec name "html doctype".
tags: {
html_format: AMP4ADS
tag_name: "!DOCTYPE"
spec_name: "html doctype (AMP4ADS)"
descriptive_name: "html !doctype"
mandatory_parent: "$ROOT"
mandatory: true
unique: true
attrs: {
name: "html"
mandatory: true
value: ""
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
# Below, we list the allowed elements in the order in which they are appear
# in the spec in section 4 "The Elements of HTML"
# (http://www.w3.org/TR/html5/single-page#html-elements).
# 4.1 The root element
# 4.1.1 The html element
tags: { # HTML tag for non-transformed AMP.
html_format: AMP
html_format: AMP4ADS
html_format: AMP4EMAIL
disabled_by: "transformed"
tag_name: "HTML"
mandatory: true
mandatory_parent: "!DOCTYPE"
attrs: {
# This attribute should always be invalid. See https://github.com/ampproject/amphtml/pull/27174
# To align with HTML spec, custom attributes should be prefixed with `data-`.
# Because `data-*` attributes are always valid AMP, the following rules explicitly disallow usage.
name: "data-amp-autocomplete-opt-in"
value: "false"
disallowed_value_regex: "false"
}
unique: true
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
tags: { # HTML tag for transformed AMP.
html_format: AMP
enabled_by: "transformed"
tag_name: "HTML"
spec_name: "html (transformed)"
mandatory: true
mandatory_parent: "!DOCTYPE"
unique: true
attrs: {
name: "i-amphtml-layout"
value: ""
}
attrs: {
name: "i-amphtml-no-boilerplate"
value: ""
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
# 4.2 Document metadata
# 4.2.1 The head element
tags: {
html_format: AMP
html_format: AMP4ADS
html_format: AMP4EMAIL
tag_name: "HEAD"
mandatory: true
mandatory_parent: "HTML"
unique: true
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
# 4.2.2 The title element
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "TITLE"
spec_name: "title"
attrs: { name: "[text]" }
}
tags: {
html_format: AMP4EMAIL
tag_name: "TITLE"
spec_name: "title [AMP4EMAIL]"
attrs: { name: "[text]" }
deprecation: "Title tags in email have no meaning. This tag may become invalid in the future."
deprecation_url: "https://github.com/ampproject/amphtml/issues/22318"
}
# 4.2.3 the base element
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "BASE"
unique: true
mandatory_parent: "HEAD"
# We only allow "/" right now because other value can cause havoc with PWA
# implementations. In the future, it may be possible to widen this to any
# absolute URL.
attrs: {
name: "href"
value: "/"
}
attrs: {
name: "target"
value_casei: "_blank"
value_casei: "_self"
value_casei: "_top"
}
}
# Disallowed.
# 4.2.4 the link element
attr_lists: {
name: "common-link-attrs"
attrs: { name: "charset" value_casei: "utf-8" }
attrs: { name: "color" }
attrs: { name: "crossorigin" }
attrs: { name: "hreflang" }
attrs: { name: "media" }
attrs: { name: "sizes" }
attrs: { name: "target" }
attrs: { name: "type" }
}
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "LINK"
spec_name: "link rel="
disallowed_ancestor: "TEMPLATE"
attrs: { name: "href" }
attrs: {
name: "rel"
mandatory: true
# There are a wide variety of link rel attribute values used in the wild as
# this attribute is used as meta-data for any html client such as search
# engines. Unfortunately, there are also a number of attribute values which
# have behavioral impacts in modern browsers. A few places where these are
# loosely documented include:
# - http://microformats.org/wiki/existing-rel-values
# - http://www.iana.org/assignments/link-relations/link-relations.xhtml
# - https://html.spec.whatwg.org/#linkTypes
# We denylist a few specific values which have browser behavior that could
# negatively impact performance.
# TODO(gregable): This could be improved such that the error message would
# report which value in a list is the one causing problems.
disallowed_value_regex: "(^|\\s)(" # Values are space separated.
"canonical|" # Handled separately below, has specific requirements.
"components|"
"import|"
"manifest|" # Handled separately below, has specific requirements.
"modulepreload|" # Handled separately below, has specific requirements.
"preload|" # Handled separately below, has specific requirements.
"serviceworker|"
"stylesheet|" # Handled separately below, has specific requirements.
"subresource"
")(\\s|$)"
# It is worth noting that user-authored tags for dns-prefectch, preconnect,
# prefetch, and prerender will be disabled by the transformations applied
# in the AMP Cache. Therefore, these hints will only be used on publisher
# origins, not on the AMP Cache.
}
attr_lists: "common-link-attrs"
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
tags: {
html_format: AMP
tag_name: "LINK"
spec_name: "link rel=canonical"
descriptive_name: "link rel=canonical"
mandatory_parent: "HEAD"
mandatory: true
unique: true
attrs: {
name: "href"
mandatory: true
value_url: {
protocol: "http"
protocol: "https"
}
disallowed_value_regex: "__amp_source_origin"
}
attrs: {
name: "rel"
value_casei: "canonical"
mandatory: true
dispatch_key: NAME_VALUE_DISPATCH
}
attr_lists: "common-link-attrs"
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
# Allow <link rel="manifest" ...> but not <link rel="manifest foo" ...>
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "LINK"
spec_name: "link rel=manifest"
descriptive_name: "link rel=manifest"
mandatory_parent: "HEAD"
satisfies: "amp-app-banner data source"
attrs: {
name: "href"
mandatory: true
value_url: {
protocol: "https"
}
disallowed_value_regex: "__amp_source_origin"
}
attrs: {
name: "rel"
value_casei: "manifest"
mandatory: true
dispatch_key: NAME_VALUE_DISPATCH
}
attr_lists: "common-link-attrs"
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
tags: {
html_format: AMP
tag_name: "LINK"
spec_name: "link rel=modulepreload"
descriptive_name: "link rel=modulepreload"
mandatory_parent: "HEAD"
attrs: {
name: "as"
mandatory: true
value: "script"
}
attrs: {
name: "crossorigin"
mandatory: true
value: "anonymous"
}
attrs: {
name: "href"
mandatory: true
value_regex: ".*\\.mjs$"
}
attrs: {
name: "rel"
mandatory: true
value_casei: "modulepreload"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "LINK"
spec_name: "link rel=preload"
descriptive_name: "link rel=preload"
disallowed_ancestor: "TEMPLATE"
attrs: { name: "as" }
attrs: { name: "href" }
attrs: {
name: "rel"
mandatory: true
value_casei: "preload"
dispatch_key: NAME_VALUE_DISPATCH
}
attrs: {
name: "imagesrcset"
value_url: {
protocol: "http"
protocol: "https"
}
disallowed_value_regex: "__amp_source_origin"
}
attrs: { name: "imagesizes" }
attr_lists: "common-link-attrs"
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# Allowlisted font providers
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "LINK"
spec_name: "link rel=stylesheet for fonts"
descriptive_name: "link rel=stylesheet for fonts"
named_id: LINK_FONT_STYLESHEET
mandatory_parent: "HEAD"
attr_lists: "nonce-attr"
attrs: { name: "async" }
attrs: { name: "crossorigin" } # SRI attribute (https://www.w3.org/TR/SRI/)
attrs: {
name: "href"
mandatory: true
value_regex: "https://cdn\\.materialdesignicons\\.com/"
"([0-9]+\\.?)+/css/materialdesignicons\\.min\\.css|"
"https://cloud\\.typography\\.com/"
"[0-9]*/[0-9]*/css/fonts\\.css|"
"https://fast\\.fonts\\.net/.*|"
"https://fonts\\.googleapis\\.com/css2?\\?.*|"
"https://fonts\\.googleapis\\.com/icon\\?.*|"
"https://fonts\\.googleapis\\.com/earlyaccess/.*\\.css|"
"https://maxcdn\\.bootstrapcdn\\.com/font-awesome/"
"([0-9]+\\.?)+/css/font-awesome\\.min\\.css(\\?.*)?|"
"https://(use|pro|kit)\\.fontawesome\\.com/releases/v([0-9]+\\.?)+"
"/css/[0-9a-zA-Z-]+\\.css|"
"https://(use|pro|kit)\\.fontawesome\\.com/[0-9a-zA-Z-]+\\.css|"
"https://use\\.typekit\\.net/[\\w\\p{L}\\p{N}_]+\\.css"
}
attrs: { name: "integrity" } # SRI attribute (https://www.w3.org/TR/SRI/)
attrs: { name: "media" }
attrs: {
name: "rel"
mandatory: true
value_casei: "stylesheet"
dispatch_key: NAME_VALUE_DISPATCH
}
attrs: {
name: "type"
value_casei: "text/css"
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#custom-fonts"
}
# itemprop=sameAs is allowed per schema.org, needs not be in head
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "LINK"
spec_name: "link itemprop=sameAs"
descriptive_name: "link itemprop=sameAs"
attrs: {
name: "href"
mandatory: true
}
attrs: {
name: "itemprop"
mandatory: true
value_casei: "sameas"
dispatch_key: NAME_VALUE_DISPATCH
}
attr_lists: "common-link-attrs"
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# rel= isn't mandatory when itemprop= is present.
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "LINK"
spec_name: "link itemprop="
descriptive_name: "link itemprop="
attrs: {
name: "href"
mandatory: true
}
attrs: {
name: "itemprop"
mandatory: true
}
attr_lists: "common-link-attrs"
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# rel= isn't mandatory when property= is present.
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "LINK"
spec_name: "link property="
descriptive_name: "link property="
attrs: {
name: "href"
mandatory: true
}
attrs: {
name: "property"
mandatory: true
}
attr_lists: "common-link-attrs"
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# 4.2.5 the meta element
# Charset must be utf8, and a specific viewport is required.
tags: {
html_format: AMP
html_format: AMP4ADS
html_format: AMP4EMAIL
tag_name: "META"
spec_name: "meta charset=utf-8"
descriptive_name: "meta charset=utf-8"
mandatory: true
mandatory_parent: "HEAD"
unique: true
attrs: {
dispatch_key: NAME_DISPATCH
name: "charset"
mandatory: true
value_casei: "utf-8"
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta name=viewport"
descriptive_name: "meta name=viewport"
mandatory: true
mandatory_parent: "HEAD"
unique: true
attrs: {
name: "content"
mandatory: true
value_properties: {
properties: { name: "width" mandatory: true value: "device-width" }
properties: { name: "height" }
properties: { name: "initial-scale" }
properties: { name: "minimum-scale" }
properties: { name: "maximum-scale" }
properties: { name: "shrink-to-fit" }
properties: { name: "user-scalable" }
properties: { name: "viewport-fit" }
}
}
attrs: {
name: "name"
mandatory: true
value: "viewport"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#required-markup"
}
# This tag is a hack to tell IE 10 to use its modern rendering engine as opposed
# to the IE8 engine. So it's explicitly allowed.
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=X-UA-Compatible"
descriptive_name: "meta http-equiv=X-UA-Compatible"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
value_properties: {
properties: { name: "ie" value: "edge" }
properties: { name: "chrome" value: "1" }
}
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "x-ua-compatible"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# Tag specific to apple-itunes-app installs, see also <amp-app-banner>.
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta name=apple-itunes-app"
mandatory_parent: "HEAD"
satisfies: "amp-app-banner data source"
attrs: {
name: "content"
mandatory: true
value_regex: ".*app-id=.*"
}
attrs: {
name: "name"
value_casei: "apple-itunes-app"
mandatory: true
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# AMP & AMP4ADS metadata, name=amp-experiments-opt-in
# https://github.com/ampproject/amphtml/blob/main/tools/experiments/README.md
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta name=amp-experiments-opt-in"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-experiments-opt-in"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-3p-iframe-src
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-3p-iframe-src"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
value_url: {
protocol: "https"
}
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-3p-iframe-src"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/components/amp-ad/"
}
# AMP metadata, name=amp-consent-blocking
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-consent-blocking"
mandatory_parent: "HEAD"
satisfies: "meta name=amp-consent-blocking"
unique: true
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-consent-blocking"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-experiment-token
# Related to AMP Origin Experiments
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-experiment-token"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-experiment-token"
dispatch_key: NAME_VALUE_DISPATCH
}
# Disabled because there are no active origin experiments; uncomment when
# there is at least one corresponding `requires` clause.
# satisfies: "amp-experiment-token"
}
# AMP metadata, name=amp-link-variable-allowed-origin
# https://github.com/ampproject/amphtml/issues/8132
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-link-variable-allowed-origin"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-link-variable-allowed-origin"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-google-client-id-api
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-google-clientid-id-api"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-google-client-id-api"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-ad-doubleclick-sra
# Enables SRA for amp-ad doubleclick Fast Fetch
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-ad-doubleclick-sra"
mandatory_parent: "HEAD"
attrs: {
name: "name"
mandatory: true
value_casei: "amp-ad-doubleclick-sra"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-list-load-more
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-list-load-more"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-list-load-more"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-recaptcha-input
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-recaptcha-input"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-recaptcha-input"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-script-src
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-script-src"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-script-src"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP4ADS metadata, name=amp4ads-id
# https://github.com/ampproject/amphtml/issues/7730
tags: {
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta name=amp4ads-id"
mandatory_parent: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp4ads-id"
dispatch_key: NAME_VALUE_DISPATCH
}
}
tags: {
html_format: AMP
html_format: AMP4ADS
html_format: AMP4EMAIL
tag_name: "META"
spec_name: "meta name= and content="
attrs: { name: "content" }
attrs: { name: "itemprop" } # itemprop is non-standard, but commonly seen.
# The validator accepts any name="..." attribute values except
# for a few specific name values which have more specific rules above or
# are altogether disallowed.
attrs: {
name: "name"
disallowed_value_regex: "(^|\\s)("
"amp-.*|"
"amp4ads-.*|"
"apple-itunes-app|"
"content-disposition|"
"revisit-after|"
"viewport"
")(\\s|$)"
}
attrs: { name: "property" } # property is non-standard, but commonly seen.
# scheme is used by Dublin Core, see issue #13993
attrs: { name: "scheme" }
}
# This is redundant with meta charset, but also harmless as long as it's
# set to utf-8.
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=Content-Type"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
value_casei: "text/html; charset=utf-8"
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "content-type"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv content-language tag
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=content-language"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "content-language"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv pics-label tag
# https://www.w3.org/PICS/
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=pics-label"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "pics-label"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv imagetoolbar tag
# https://msdn.microsoft.com/en-us/library/ms532986(v=vs.85).aspx
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=imagetoolbar"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "imagetoolbar"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv content-style-type
# https://www.w3.org/TR/REC-html40/present/styles#h-14.2.1
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=Content-Style-Type"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
value_casei: "text/css"
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "content-style-type"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv content-script-type
# https://www.w3.org/TR/html4/interact/scripts#h-18.2.2.1
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=Content-Script-Type"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
value_casei: "text/javascript"
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "content-script-type"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv origin-trial tag
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=origin-trial"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "origin-trial"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv resource-type
# http://www.metatags.info/meta_http_equiv_resource_type
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta http-equiv=resource-type"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "resource-type"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# http-equiv x-dns-prefetch-control
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta http-equiv=x-dns-prefetch-control"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
value_casei: "off"
value_casei: "on"
}
attrs: {
name: "http-equiv"
mandatory: true
value_casei: "x-dns-prefetch-control"
dispatch_key: NAME_VALUE_DISPATCH
}
spec_url: "https://amp.dev/documentation/guides-and-tutorials/learn/spec/amphtml/#html-tags"
}
# AMP metadata, name=amp-ad-enable-refresh
# Enables Refresh for amp-ad doubleclick Fast Fetch
tags: {
html_format: AMP
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta name=amp-ad-enable-refresh"
mandatory_ancestor: "HEAD"
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-ad-enable-refresh"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-to-amp-navigation
# Enables AMP-to-AMP navigation
tags: {
html_format: AMP
tag_name: "META"
spec_name: "meta name=amp-to-amp-navigation"
mandatory_parent: "HEAD"
unique: true
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"
mandatory: true
value_casei: "amp-to-amp-navigation"
dispatch_key: NAME_VALUE_DISPATCH
}
}
# AMP metadata, name=amp-cta-type
# Specifies the Single Page Story Ad call to action enum
tags: {
html_format: AMP4ADS
tag_name: "META"
spec_name: "meta name=amp-cta-type"
mandatory_parent: "HEAD"
unique: true
attrs: {
name: "content"
mandatory: true
}
attrs: {
name: "name"