diff --git a/includes/sanitizers/class-amp-meta-sanitizer.php b/includes/sanitizers/class-amp-meta-sanitizer.php
index 57868edeec6..55207f0a7e9 100644
--- a/includes/sanitizers/class-amp-meta-sanitizer.php
+++ b/includes/sanitizers/class-amp-meta-sanitizer.php
@@ -34,6 +34,7 @@ class AMP_Meta_Sanitizer extends AMP_Base_Sanitizer {
 	 * Tags array keys.
 	 */
 	const TAG_CHARSET        = 'charset';
+	const TAG_HTTP_EQUIV     = 'http-equiv';
 	const TAG_VIEWPORT       = 'viewport';
 	const TAG_AMP_SCRIPT_SRC = 'amp_script_src';
 	const TAG_OTHER          = 'other';
@@ -54,6 +55,7 @@ class AMP_Meta_Sanitizer extends AMP_Base_Sanitizer {
 	 */
 	protected $meta_tags = [
 		self::TAG_CHARSET        => [],
+		self::TAG_HTTP_EQUIV     => [],
 		self::TAG_VIEWPORT       => [],
 		self::TAG_AMP_SCRIPT_SRC => [],
 		self::TAG_OTHER          => [],
@@ -66,19 +68,41 @@ class AMP_Meta_Sanitizer extends AMP_Base_Sanitizer {
 	 */
 	const AMP_VIEWPORT = 'width=device-width';
 
+	/**
+	 * Spec name for the tag spec for meta elements that are allowed in the body.
+	 *
+	 * @since 1.5.2
+	 * @var string
+	 */
+	const BODY_ANCESTOR_META_TAG_SPEC_NAME = 'meta name= and content=';
+
+	/**
+	 * Get tag spec for meta tags which are allowed in the body.
+	 *
+	 * @since 1.5.2
+	 * @return string Deny pattern.
+	 */
+	private function get_body_meta_tag_name_attribute_deny_pattern() {
+		static $pattern = null;
+		if ( null === $pattern ) {
+			$tag_spec = current(
+				array_filter(
+					AMP_Allowed_Tags_Generated::get_allowed_tag( 'meta' ),
+					static function ( $spec ) {
+						return isset( $spec['tag_spec']['spec_name'] ) && self::BODY_ANCESTOR_META_TAG_SPEC_NAME === $spec['tag_spec']['spec_name'];
+					}
+				)
+			);
+			$pattern  = '/' . $tag_spec['attr_spec_list']['name']['blacklisted_value_regex'] . '/';
+		}
+		return $pattern;
+	}
+
 	/**
 	 * Sanitize.
 	 */
 	public function sanitize() {
-		$meta_elements = $this->dom->getElementsByTagName( static::$tag );
-
-		// Remove all nodes for easy reordering later on.
-		$meta_elements = array_map(
-			static function ( $element ) {
-				return $element->parentNode->removeChild( $element );
-			},
-			iterator_to_array( $meta_elements, false )
-		);
+		$meta_elements = iterator_to_array( $this->dom->getElementsByTagName( static::$tag ), false );
 
 		foreach ( $meta_elements as $meta_element ) {
 
@@ -96,13 +120,19 @@ static function ( $element ) {
 			 * @var DOMElement $meta_element
 			 */
 			if ( $meta_element->hasAttribute( Attribute::CHARSET ) ) {
-				$this->meta_tags[ self::TAG_CHARSET ][] = $meta_element;
+				$this->meta_tags[ self::TAG_CHARSET ][] = $meta_element->parentNode->removeChild( $meta_element );
+			} elseif ( $meta_element->hasAttribute( Attribute::HTTP_EQUIV ) ) {
+				$this->meta_tags[ self::TAG_HTTP_EQUIV ][] = $meta_element->parentNode->removeChild( $meta_element );
 			} elseif ( Attribute::VIEWPORT === $meta_element->getAttribute( Attribute::NAME ) ) {
-				$this->meta_tags[ self::TAG_VIEWPORT ][] = $meta_element;
+				$this->meta_tags[ self::TAG_VIEWPORT ][] = $meta_element->parentNode->removeChild( $meta_element );
 			} elseif ( Attribute::AMP_SCRIPT_SRC === $meta_element->getAttribute( Attribute::NAME ) ) {
-				$this->meta_tags[ self::TAG_AMP_SCRIPT_SRC ][] = $meta_element;
-			} else {
-				$this->meta_tags[ self::TAG_OTHER ][] = $meta_element;
+				$this->meta_tags[ self::TAG_AMP_SCRIPT_SRC ][] = $meta_element->parentNode->removeChild( $meta_element );
+			} elseif (
+				$meta_element->hasAttribute( 'name' )
+				&&
+				preg_match( $this->get_body_meta_tag_name_attribute_deny_pattern(), $meta_element->getAttribute( 'name' ) )
+			) {
+				$this->meta_tags[ self::TAG_OTHER ][] = $meta_element->parentNode->removeChild( $meta_element );
 			}
 		}
 
diff --git a/tests/php/test-class-amp-meta-sanitizer.php b/tests/php/test-class-amp-meta-sanitizer.php
index 8cba767ce2c..fbbc0f86e78 100644
--- a/tests/php/test-class-amp-meta-sanitizer.php
+++ b/tests/php/test-class-amp-meta-sanitizer.php
@@ -12,6 +12,37 @@
  */
 class Test_AMP_Meta_Sanitizer extends WP_UnitTestCase {
 
+	/**
+	 * Test that the expected tag specs exist for the body.
+	 */
+	public function test_expected_meta_tags() {
+		$named_specs = array_filter(
+			AMP_Allowed_Tags_Generated::get_allowed_tag( 'meta' ),
+			static function ( $spec ) {
+				return isset( $spec['tag_spec']['spec_name'] ) && AMP_Meta_Sanitizer::BODY_ANCESTOR_META_TAG_SPEC_NAME === $spec['tag_spec']['spec_name'];
+			}
+		);
+		$this->assertCount( 1, $named_specs );
+
+		$body_ok_specs = array_filter(
+			AMP_Allowed_Tags_Generated::get_allowed_tag( 'meta' ),
+			static function ( $spec ) {
+				$head_required = (
+					( isset( $spec['tag_spec']['mandatory_parent'] ) && 'head' === $spec['tag_spec']['mandatory_parent'] )
+					||
+					( isset( $spec['tag_spec']['mandatory_ancestor'] ) && 'head' === $spec['tag_spec']['mandatory_ancestor'] )
+				);
+				return ! $head_required;
+			}
+		);
+
+		$this->assertEquals( $named_specs, $body_ok_specs );
+
+		$spec = current( $named_specs );
+		$this->assertArrayHasKey( 'name', $spec['attr_spec_list'] );
+		$this->assertEquals( [ 'blacklisted_value_regex' ], array_keys( $spec['attr_spec_list']['name'] ) );
+	}
+
 	/**
 	 * Provide data to the test_sanitize method.
 	 *
@@ -30,7 +61,42 @@ public function get_data_for_sanitize() {
 
 		$amp_boilerplate = amp_get_boilerplate_code();
 
-		return [
+		$meta_charset  = '<meta charset="utf-8">';
+		$meta_viewport = '<meta name="viewport" content="width=device-width">';
+
+		$meta_tags_allowed_in_body = '
+			<span itemprop="author" itemscope itemtype="https://schema.org/Person">
+				<meta itemprop="name" content="Siva">
+			</span>
+			<meta itemprop="datePublished" content="2020-03-24T18:05:15+05:30">
+			<meta itemprop="dateModified" content="2020-03-24T18:05:15+05:30">
+			<meta itemscope itemprop="mainEntityOfPage" itemtype="https://schema.org/WebPage" itemid="https://example.com/">
+			<span itemprop="publisher" itemscope itemtype="https://schema.org/Organization">
+				<span itemprop="logo" itemscope itemtype="https://schema.org/ImageObject">
+					<meta itemprop="url" content="https://example/logo.png">
+				</span>
+				<meta itemprop="name" content="Example">
+				<meta itemprop="url" content="https://example.com">
+			</span>
+			<meta itemprop="headline " content="This is a test">
+			<span itemprop="image" itemscope itemtype="https://schema.org/ImageObject">
+				<meta itemprop="url" content="https://example.com/foo.jpg">
+				<meta itemprop="width" content="1280"><meta itemprop="height" content="720">
+			</span>
+			<div itemscope id="amanda" itemref="a b"></div>
+			<p id="a">Name: <span itemprop="name">Amanda</span> </p>
+				<div id="b" itemprop="band" itemscope itemref="c"></div>
+			<div id="c">
+				<p>Band: <span itemprop="name">Jazz Band</span> </p>
+				<p>Size: <span itemprop="size">12</span> players</p>
+			</div>
+			<meta id="foo">
+			<meta name="greeting" content="Hello!">
+			<meta name="keywords" content="Meta Tags, Metadata" scheme="ISBN">
+			<meta content="This is a basic text" property="og:title">
+		';
+
+		$data = [
 			'Do not break the correct charset tag'        => [
 				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width">' . $amp_boilerplate . '</head><body></body></html>',
 				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width">' . $amp_boilerplate . '</head><body></body></html>',
@@ -65,7 +131,79 @@ public function get_data_for_sanitize() {
 				'<!DOCTYPE html><html><head><meta name="amp-script-src" content="' . esc_attr( $script1_hash ) . '"><meta charset="utf-8"><meta name="amp-script-src" content="' . esc_attr( $script2_hash ) . '"><meta name="viewport" content="width=device-width"><meta name="amp-script-src" content="' . esc_attr( $script3_hash ) . '">' . $amp_boilerplate . '</head><body><meta name="amp-script-src" content="' . esc_attr( $script4_hash ) . '"></body></html>',
 				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width"><meta name="amp-script-src" content="' . esc_attr( $script1_hash ) . ' ' . esc_attr( $script2_hash ) . ' ' . esc_attr( $script3_hash ) . ' ' . esc_attr( $script4_hash ) . '">' . $amp_boilerplate . '</head><body></body></html>',
 			],
+
+			'Remove legacy meta http-equiv=Content-Type'  => [
+				'<!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8">' . $amp_boilerplate . '</head><body></body></html>',
+				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width">' . $amp_boilerplate . '</head><body></body></html>',
+			],
+
+			'Process invalid meta http-equiv value'       => [
+				// Note the AMP_Tag_And_Attribute_Sanitizer removes the http-equiv attribute because the content is invalid.
+				'<!DOCTYPE html><html><head>' . $amp_boilerplate . '</head><body><meta http-equiv="Content-Type" content="text/vbscript"></body></html>',
+				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta content="text/vbscript"><meta name="viewport" content="width=device-width">' . $amp_boilerplate . '</head><body></body></html>',
+			],
+
+			'Disallowed meta=content-deposition'          => [
+				'<!DOCTYPE html><html><head>' . $amp_boilerplate . '<meta name="content-disposition" content="inline; filename=data.csv"></head><body></body></html>',
+				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width"><meta content="inline; filename=data.csv">' . $amp_boilerplate . '</head><body></body></html>',
+			],
+
+			'Disallowed meta=revisit-after'               => [
+				'<!DOCTYPE html><html><head>' . $amp_boilerplate . '<meta name="revisit-after" content="7 days"></head><body></body></html>',
+				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width"><meta content="7 days">' . $amp_boilerplate . '</head><body></body></html>',
+			],
+
+			'Disallowed meta=amp-bogus'                   => [
+				'<!DOCTYPE html><html><head>' . $amp_boilerplate . '<meta name="amp-bogus" content="bad"></head><body></body></html>',
+				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width"><meta content="bad">' . $amp_boilerplate . '</head><body></body></html>',
+			],
+
+			'Ignore generic meta tags'                    => [
+				'<!DOCTYPE html><html><head><meta charset="utf-8">' . $amp_boilerplate . '</head><body>' . $meta_tags_allowed_in_body . '</body></html>',
+				'<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width">' . $amp_boilerplate . '</head><body>' . $meta_tags_allowed_in_body . '</body></html>',
+			],
+		];
+
+		$http_equiv_specs = [
+			'meta http-equiv=X-UA-Compatible'        => '<meta http-equiv="X-UA-Compatible" content="IE=edge">',
+			'meta http-equiv=content-language'       => '<meta http-equiv="content-language" content="labellist">',
+			'meta http-equiv=pics-label'             => '<meta http-equiv="PICS-Label" content="en-US">',
+			'meta http-equiv=imagetoolbar'           => '<meta http-equiv="imagetoolbar" content="false">',
+			'meta http-equiv=Content-Style-Type'     => '<meta http-equiv="Content-Style-Type" content="text/css">',
+			'meta http-equiv=Content-Script-Type'    => '<meta http-equiv="Content-Script-Type" content="text/javascript">',
+			'meta http-equiv=origin-trial'           => '<meta http-equiv="origin-trial" content="...">',
+			'meta http-equiv=resource-type'          => '<meta http-equiv="resource-type" content="document">',
+			'meta http-equiv=x-dns-prefetch-control' => '<meta http-equiv="x-dns-prefetch-control" content="on">',
+		];
+		foreach ( $http_equiv_specs as $equiv_spec => $tag ) {
+			$data[ "Verify http-equiv moved: $equiv_spec" ] = [
+				"<!DOCTYPE html><html><head>{$meta_charset}{$meta_viewport}{$amp_boilerplate}</head><body>{$tag}</body></html>",
+				"<!DOCTYPE html><html><head>{$meta_charset}{$tag}{$meta_viewport}{$amp_boilerplate}</head><body></body></html>",
+			];
+		}
+
+		$named_specs = [
+			'meta name=apple-itunes-app'                 => '<meta name="apple-itunes-app" content="app-id=myAppStoreID, affiliate-data=myAffiliateData, app-argument=myURL">',
+			'meta name=amp-experiments-opt-in'           => '<meta name="amp-experiments-opt-in" content="experiment-a,experiment-b">',
+			'meta name=amp-3p-iframe-src'                => '<meta name="amp-3p-iframe-src" content="https://storage.googleapis.com/amp-testing.appspot.com/public/remote.html">',
+			'meta name=amp-consent-blocking'             => '<meta name="amp-consent-blocking" content="">',
+			'meta name=amp-experiment-token'             => '<meta name="amp-experiment-token" content="{copy your token here}">',
+			'meta name=amp-link-variable-allowed-origin' => '<meta name="amp-link-variable-allowed-origin" content="https://example.com https://example.org">',
+			'meta name=amp-google-clientid-id-api'       => '<meta name="amp-google-client-id-api" content="googleanalytics">',
+			'meta name=amp-ad-doubleclick-sra'           => '<meta name="amp-ad-doubleclick-sra">',
+			'meta name=amp-list-load-more'               => '<meta name="amp-list-load-more" content="">',
+			'meta name=amp-recaptcha-input'              => '<meta name="amp-recaptcha-input" content="">',
+			'meta name=amp-ad-enable-refresh'            => '<meta name="amp-ad-enable-refresh" content="network1=refresh_interval1,network2=refresh_interval2,...">',
+			'meta name=amp-to-amp-navigation'            => '<meta name="amp-to-amp-navigation" content="AMP-Redirect-To; AMP.navigateTo">',
 		];
+		foreach ( $named_specs as $named_spec => $tag ) {
+			$data[ "Verify meta[name] moved: $named_spec" ] = [
+				"<!DOCTYPE html><html><head>{$meta_charset}{$meta_viewport}{$amp_boilerplate}</head><body>{$tag}</body></html>",
+				"<!DOCTYPE html><html><head>{$meta_charset}{$meta_viewport}{$tag}{$amp_boilerplate}</head><body></body></html>",
+			];
+		}
+
+		return $data;
 	}
 
 	/**
@@ -82,7 +220,10 @@ public function test_sanitize( $source_content, $expected_content ) {
 		$sanitizer = new AMP_Meta_Sanitizer( $dom );
 		$sanitizer->sanitize();
 
-		$sanitizer = new AMP_Tag_And_Attribute_Sanitizer( $dom );
+		$sanitizer = new AMP_Tag_And_Attribute_Sanitizer(
+			$dom,
+			[ 'use_document_element' => true ]
+		);
 		$sanitizer->sanitize();
 
 		$this->assertEqualMarkup( $expected_content, $dom->saveHTML() );
diff --git a/tests/php/test-tag-and-attribute-sanitizer.php b/tests/php/test-tag-and-attribute-sanitizer.php
index 9acc2491ead..48dd2c2d1bc 100644
--- a/tests/php/test-tag-and-attribute-sanitizer.php
+++ b/tests/php/test-tag-and-attribute-sanitizer.php
@@ -2975,6 +2975,12 @@ public function get_html_data() {
 				null,
 				[ 'amp-subscriptions' ],
 			],
+			'bad http-equiv meta tag'                 => [
+				'<html><head><meta charset="utf-8"><meta http-equiv="Content-Script-Type" content="text/vbscript"></head><body></body></html>',
+				'<html><head><meta charset="utf-8"><meta content="text/vbscript"></head><body></body></html>',
+				[],
+				[ AMP_Tag_And_Attribute_Sanitizer::DISALLOWED_ATTR ],
+			],
 		];
 
 		$bad_dev_mode_document = sprintf(