diff --git a/src/wp-admin/admin-footer.php b/src/wp-admin/admin-footer.php
index fef0c06bbf725..32f24e536e599 100644
--- a/src/wp-admin/admin-footer.php
+++ b/src/wp-admin/admin-footer.php
@@ -114,6 +114,14 @@
 ?>
 
 <div class="clear"></div></div><!-- wpwrap -->
-<script>if(typeof wpOnload==='function')wpOnload();</script>
+<?php
+wp_print_inline_script_tag(
+	<<<'JS'
+	if ( typeof wpOnload === 'function' ) {
+		wpOnload();
+	}
+	JS
+);
+?>
 </body>
 </html>
diff --git a/src/wp-admin/async-upload.php b/src/wp-admin/async-upload.php
index 5fbdd370c5c1a..0bd955e5d0428 100644
--- a/src/wp-admin/async-upload.php
+++ b/src/wp-admin/async-upload.php
@@ -145,7 +145,42 @@
 		$_FILES['async-upload']['name']
 	);
 
-	echo '<script>_.delay(function() {wp.a11y.speak(' . wp_json_encode( $speak_message, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ) . ");}, 1500);jQuery( 'button#{$button_unique_id}' ).on( 'click', function() {jQuery(this).parents('div.media-item').slideUp(200, function(){jQuery(this).remove();wp.a11y.speak( wp.i18n.__( 'Error dismissed.' ) );jQuery( '#plupload-browse-button' ).trigger( 'focus' );})});</script>\n";
+	$js_function = <<<'JS'
+		/**
+		 * Announces the upload failure and wires up its dismiss button.
+		 *
+		 * @param {JQueryStatic} $                   The jQuery object.
+		 * @param {Object}       args                PHP exports.
+		 * @param {string}       args.speakMessage   Message announced to assistive technology.
+		 * @param {string}       args.buttonSelector Selector for the notice's dismiss button.
+		 * @return {void}
+		 */
+		( $, { speakMessage, buttonSelector } ) => {
+			setTimeout( () => wp.a11y.speak( speakMessage ), 1500 );
+			$( buttonSelector ).on( 'click', function () {
+				$( this )
+					.parents( 'div.media-item' )
+					.slideUp( 200, function () {
+						$( this ).remove();
+						wp.a11y.speak( wp.i18n.__( 'Error dismissed.' ) );
+						$( '#plupload-browse-button' ).trigger( 'focus' );
+					} );
+			} );
+		}
+	JS;
+	wp_print_inline_script_tag(
+		sprintf(
+			'( %s )( jQuery, %s )',
+			$js_function,
+			wp_json_encode(
+				array(
+					'speakMessage'   => $speak_message,
+					'buttonSelector' => 'button#' . $button_unique_id,
+				),
+				JSON_HEX_TAG | JSON_UNESCAPED_SLASHES
+			)
+		)
+	);
 	exit;
 }
 
diff --git a/src/wp-admin/install.php b/src/wp-admin/install.php
index b6b7a08f2a5aa..977e231cccdf1 100644
--- a/src/wp-admin/install.php
+++ b/src/wp-admin/install.php
@@ -470,17 +470,30 @@ function display_setup_form( $error = null ) {
 }
 
 if ( ! wp_is_mobile() ) {
-	?>
-<script>var t = document.getElementById('weblog_title'); if (t){ t.focus(); }</script>
-	<?php
+	wp_print_inline_script_tag(
+		<<<'JS'
+		const t = document.getElementById( 'weblog_title' );
+		if ( t ) {
+			t.focus();
+		}
+		JS
+	);
 }
 
 wp_print_scripts( $scripts_to_print );
+
+wp_print_inline_script_tag(
+	<<<'JS'
+	/**
+	 * Shows the content intended only for browsers with JS enabled.
+	 *
+	 * @param {JQueryStatic} $ The jQuery object.
+	 */
+	jQuery( function ( $ ) {
+		$( '.hide-if-no-js' ).removeClass( 'hide-if-no-js' );
+	} );
+	JS
+);
 ?>
-<script>
-jQuery( function( $ ) {
-	$( '.hide-if-no-js' ).removeClass( 'hide-if-no-js' );
-} );
-</script>
 </body>
 </html>