diff --git a/UniversalLanguageSelector.hooks.php b/UniversalLanguageSelector.hooks.php
index 7cea4c04..f5451bdb 100644
--- a/UniversalLanguageSelector.hooks.php
+++ b/UniversalLanguageSelector.hooks.php
@@ -462,7 +462,7 @@ class UniversalLanguageSelectorHooks {
 	 * @param ResourceLoader $resourceLoader
 	 */
 	public static function onResourceLoaderRegisterModules( ResourceLoader $resourceLoader ) {
-		global $wgULSEventLogging, $wgVersion;
+		global $wgULSEventLogging;
 
 		$modules = [];
 		$modules['ext.uls.compactlinks'] = [
@@ -482,10 +482,6 @@ class UniversalLanguageSelectorHooks {
 			'localBasePath' => __DIR__ . '/resources',
 			'remoteExtPath' => 'UniversalLanguageSelector/resources'
 		];
-		if ( version_compare( $wgVersion, '1.29', '<' ) ) {
-			// Support: MediaWiki 1.28 and earlier (T162590)
-			$modules['ext.uls.compactlinks']['dependencies'][] = 'es5-shim';
-		}
 
 		if ( $wgULSEventLogging ) {
 			$modules['ext.uls.eventlogger'] = [
diff --git a/includes/FontRepoCompiler.php b/includes/FontRepoCompiler.php
index a6250e3f..35d56fe8 100644
--- a/includes/FontRepoCompiler.php
+++ b/includes/FontRepoCompiler.php
@@ -93,7 +93,7 @@ class FontRepoCompiler {
 
 		foreach ( [ 'woff', 'woff2' ] as $format ) {
 			if ( isset( $font[$format] ) ) {
-				$info[$format] = $this->getFontWebPath( $fontpath, $fontdir, $font[$format] );
+				$info[$format] = OutputPage::transformFilePath( $fontdir, $fontpath, $font[$format] );
 			}
 		}
 
@@ -101,7 +101,7 @@ class FontRepoCompiler {
 		if ( !isset( $info['woff'] ) ) {
 			foreach ( glob( "$fontpath/*.{woff,woff2}", GLOB_BRACE ) as $fontfile ) {
 				$type = substr( $fontfile, strrpos( $fontfile, '.' ) + 1 );
-				$info[$type] = $this->getFontWebPath( $fontpath, $fontdir, basename( $fontfile ) );
+				$info[$type] = OutputPage::transformFilePath( $fontdir, $fontpath, basename( $fontfile ) );
 			}
 		}
 
@@ -120,14 +120,4 @@ class FontRepoCompiler {
 
 		return $info;
 	}
-
-	private function getFontWebPath( $path, $fontdir, $filename ) {
-		if ( method_exists( 'OutputPage', 'transformFilePath' ) ) {
-			return OutputPage::transformFilePath( $fontdir, $path, $filename );
-		}
-
-		// BC for MediaWiki <= 1.27
-		$hash = md5_file( "$path/$filename" );
-		return "$fontdir/$filename?" . substr( $hash, 0, 5 );
-	}
 }
diff --git a/resources/js/ext.uls.compactlinks.js b/resources/js/ext.uls.compactlinks.js
index 018eecce..20f02d00 100644
--- a/resources/js/ext.uls.compactlinks.js
+++ b/resources/js/ext.uls.compactlinks.js
@@ -439,15 +439,9 @@
 	 * @return {Array} List of language codes in which there are articles with badges
 	 */
 	CompactInterlanguageList.prototype.filterByBadges = function () {
-		// Can be removed when backwards compatibility before
-		// MediaWiki 1.28 is no longer needed
-		var targetSelector = parseFloat( mw.config.get( 'wgVersion' ) ) >= 1.28 ?
-			'.interlanguage-link-target' :
-			'a';
-
 		return $( '#p-lang' ).find( '[class*="badge"]' ).map( function ( i, el ) {
 			return convertMediaWikiLanguageCodeToULS(
-				$( el ).find( targetSelector ).attr( 'lang' )
+				$( el ).find( '.interlanguage-link-target' ).attr( 'lang' )
 			);
 		} ).toArray();
 	};
@@ -459,16 +453,9 @@
 	 * @return {Object} List of existing language codes and their hrefs
 	 */
 	CompactInterlanguageList.prototype.getInterlanguageList = function () {
-		var targetSelector,
-			interlanguageList = {};
+		var interlanguageList = {};
 
-		// Can be removed when backwards compatibility before
-		// MediaWiki 1.28 is no longer needed
-		targetSelector = parseFloat( mw.config.get( 'wgVersion' ) ) >= 1.28 ?
-			'.interlanguage-link-target' :
-			'li.interlanguage-link > a';
-
-		this.$interlanguageList.find( targetSelector ).each( function () {
+		this.$interlanguageList.find( '.interlanguage-link-target' ).each( function () {
 			var langCode = convertMediaWikiLanguageCodeToULS( this.getAttribute( 'lang' ) );
 
 			interlanguageList[ langCode ] = {
diff --git a/resources/js/ext.uls.interface.js b/resources/js/ext.uls.interface.js
index 54dc21af..fcdc0740 100644
--- a/resources/js/ext.uls.interface.js
+++ b/resources/js/ext.uls.interface.js
@@ -133,16 +133,7 @@
 		}
 
 		function showTipsy( timeout ) {
-			var offset, tipsyTimer = 0;
-
-			// BC for MW 1.27
-			if ( ulsPopup.setFloatableContainer === undefined ) {
-				offset = $ulsTrigger.offset();
-				ulsPopup.$element.css( {
-					top: offset.top + 24,
-					left: offset.left + $ulsTrigger.outerWidth() / 2
-				} );
-			}
+			var tipsyTimer = 0;
 
 			ulsPopup.toggle( true );
 			ulsPopup.toggleClipping( false );