diff --git a/RELEASE-NOTES-1.35 b/RELEASE-NOTES-1.35
index 6401d71dddf..6891d7cedf3 100644
--- a/RELEASE-NOTES-1.35
+++ b/RELEASE-NOTES-1.35
@@ -67,6 +67,8 @@ For notes on 1.34.x and older releases, see HISTORY.
 * …
 
 === New user-facing features in 1.35 ===
+* (T204618) Whitelisted the aria-hidden HTML attribute for all elements in
+  wikitext.
 * (T13456) Special:EditPage, Special:PageHistory, Special:PageInfo, and
   Special:Purge have been created as shortcuts for each action.
   Special:EditPage/Foo redirects to title=foo&action=edit, with PageHistory,
diff --git a/includes/parser/Sanitizer.php b/includes/parser/Sanitizer.php
index 21cb5387069..fbcd316c1ba 100644
--- a/includes/parser/Sanitizer.php
+++ b/includes/parser/Sanitizer.php
@@ -1755,6 +1755,7 @@ class Sanitizer {
 			# WAI-ARIA
 			'aria-describedby',
 			'aria-flowto',
+			'aria-hidden',
 			'aria-label',
 			'aria-labelledby',
 			'aria-owns',
diff --git a/tests/phpunit/includes/parser/SanitizerTest.php b/tests/phpunit/includes/parser/SanitizerTest.php
index 47ded5a922c..cff3d6d4347 100644
--- a/tests/phpunit/includes/parser/SanitizerTest.php
+++ b/tests/phpunit/includes/parser/SanitizerTest.php
@@ -140,6 +140,10 @@ class SanitizerTest extends MediaWikiTestCase {
 				[ 'id' => 'foo bar', 'itemprop' => 'foo', 'content' => 'bar' ],
 				[ 'itemprop' => 'foo', 'content' => 'bar' ],
 			],
+			[ 'div',
+			  [ 'role' => 'presentation', 'aria-hidden' => 'true' ],
+			  [ 'role' => 'presentation', 'aria-hidden' => 'true' ],
+			],
 		];
 	}