fix(cdk/scrolling): Fix undefined error when documentElement.style is undefined (#31904)

abbasc52 · adolgachev · commit e8e8662ab68e · 2025-09-26T13:49:21.000-07:00
(cherry picked from commit 667a007)
diff --git a/src/cdk/platform/features/scrolling.ts b/src/cdk/platform/features/scrolling.ts
@@ -42,7 +42,7 @@ export function supportsScrollBehavior(): boolean {
     }
 
     // If the element can have a `scrollBehavior` style, we can be sure that it's supported.
-    if ('scrollBehavior' in document.documentElement!.style) {
+    if (document.documentElement?.style && 'scrollBehavior' in document.documentElement!.style) {
       scrollBehaviorSupported = true;
     } else {
       // At this point we have 3 possibilities: `scrollTo` isn't supported at all, it's

Original file line number	Diff line number	Diff line change
`@@ -42,7 +42,7 @@ export function supportsScrollBehavior(): boolean {`
`42`	`42`	`}`
`43`	`43`
`44`	`44`	// If the element can have a `scrollBehavior` style, we can be sure that it's supported.
`45`		`- if ('scrollBehavior' in document.documentElement!.style) {`
	`45`	`+ if (document.documentElement?.style && 'scrollBehavior' in document.documentElement!.style) {`
`46`	`46`	`scrollBehaviorSupported = true;`
`47`	`47`	`} else {`
`48`	`48`	// At this point we have 3 possibilities: `scrollTo` isn't supported at all, it's