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	diff --git a/src/infrastructure/markup/rule/PhabricatorYoutubeRemarkupRule.php b/src/infrastructure/markup/rule/PhabricatorYoutubeRemarkupRule.php
	index 25422b970d..cbf322b2d9 100644
	--- a/src/infrastructure/markup/rule/PhabricatorYoutubeRemarkupRule.php
	+++ b/src/infrastructure/markup/rule/PhabricatorYoutubeRemarkupRule.php
	@@ -1,55 +1,60 @@
	<?php

	final class PhabricatorYoutubeRemarkupRule extends PhutilRemarkupRule {

	public function getPriority() {
	return 350.0;
	}

	public function apply($text) {
	try {
	$uri = new PhutilURI($text);
	} catch (Exception $ex) {
	return $text;
	}

	$domain = $uri->getDomain();
	if (!preg_match('/(^\|\.)youtube\.com\z/', $domain)) {
	return $text;
	}

	$params = $uri->getQueryParams();
	$v_param = idx($params, 'v');
	if (!strlen($v_param)) {
	return $text;
	}

	$text_mode = $this->getEngine()->isTextMode();
	$mail_mode = $this->getEngine()->isHTMLMailMode();

	if ($text_mode \|\| $mail_mode) {
	return $text;
	}

	$youtube_src = 'https://www.youtube.com/embed/'.$v_param;

	$iframe = $this->newTag(
	'div',
	array(
	'class' => 'embedded-youtube-video',
	),
	$this->newTag(
	'iframe',
	array(
	'width' => '650',
	'height' => '400',
	'style' => 'margin: 1em auto; border: 0px;',
	'src' => $youtube_src,
	'frameborder' => 0,
	),
	''));

	return $this->getEngine()->storeText($iframe);
	}

	+ public function didMarkupText() {
	+ CelerityAPI::getStaticResourceResponse()
	+ ->addContentSecurityPolicyURI('frame-src', 'https://www.youtube.com/');
	+ }
	+
	}