Tools/TestWebKitAPI/Tests/ios/ScrollViewInsetTests.mm - WebKit - Git at Google

 /*
  * Copyright (C) 2018 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */

 #import "config.h"

 #if PLATFORM(IOS_FAMILY)

 #import "PlatformUtilities.h"
 #import "TestNavigationDelegate.h"
 #import "TestWKWebView.h"
 #import "UIKitSPI.h"
 #import <WebKit/WKWebViewPrivate.h>
 #import <wtf/Vector.h>

 @interface ScrollViewDelegate : NSObject<UIScrollViewDelegate> {
     @public Vector<CGPoint> _contentOffsetHistory;
 }
 @end

 @implementation ScrollViewDelegate

 - (void)scrollViewDidScroll:(UIScrollView *)scrollView
 {
     auto contentOffset = scrollView.contentOffset;
     if (_contentOffsetHistory.isEmpty() || !CGPointEqualToPoint(_contentOffsetHistory.last(), contentOffset))
         _contentOffsetHistory.append(contentOffset);
 }

 @end

 @interface AsyncPolicyDelegateForInsetTest : NSObject<WKNavigationDelegate> {
     @public bool _navigationComplete;
 }
 @property (nonatomic, copy) void (^webContentProcessDidTerminate)(WKWebView *);
 @end

 @implementation AsyncPolicyDelegateForInsetTest

 - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
 {
     _navigationComplete = true;
 }

 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
 {
     int64_t deferredWaitTime = 100 * NSEC_PER_MSEC;
     dispatch_time_t when = dispatch_time(DISPATCH_TIME_NOW, deferredWaitTime);
     dispatch_after(when, dispatch_get_main_queue(), ^{
         decisionHandler(WKNavigationActionPolicyAllow);
     });
 }

 - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
 {
     int64_t deferredWaitTime = 100 * NSEC_PER_MSEC;
     dispatch_time_t when = dispatch_time(DISPATCH_TIME_NOW, deferredWaitTime);
     dispatch_after(when, dispatch_get_main_queue(), ^{
         decisionHandler(WKNavigationResponsePolicyAllow);
     });
 }

 - (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView
 {
     if (_webContentProcessDidTerminate)
         _webContentProcessDidTerminate(webView);
 }
 @end

 namespace TestWebKitAPI {

 static const CGFloat viewHeight = 500;
 static NSString *veryTallDocumentMarkup = @"<meta name='viewport' content='width=device-width, initial-scale=1'><body style='width: 100%; height: 5000px'>";

 static void waitUntilInnerHeightIs(TestWKWebView *webView, CGFloat expectedValue)
 {
     int tries = 0;
     do {
         Util::sleep(0.1);
     } while ([[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue] != expectedValue && ++tries <= 100);
 }

 TEST(ScrollViewInsetTests, InnerHeightWithLargeTopContentInset)
 {
     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
     [webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
     [webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];

     [webView stringByEvaluatingJavaScript:@"scrollTo(0, 10)"];
     waitUntilInnerHeightIs(webView.get(), viewHeight);
     EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
     EXPECT_EQ(10, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

     [webView stringByEvaluatingJavaScript:@"scrollBy(0, -10)"];
     waitUntilInnerHeightIs(webView.get(), viewHeight);
     EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
     EXPECT_EQ(0, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

     [webView stringByEvaluatingJavaScript:@"scrollBy(0, 20)"];
     waitUntilInnerHeightIs(webView.get(), viewHeight);
     EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
     EXPECT_EQ(20, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);
 }

 TEST(ScrollViewInsetTests, InnerHeightWithLargeBottomContentInset)
 {
     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
     [webView scrollView].contentInset = UIEdgeInsetsMake(0, 0, 400, 0);
     [webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];
     [webView stringByEvaluatingJavaScript:@"scrollTo(0, 10)"];
     [webView waitForNextPresentationUpdate];
     EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
     EXPECT_EQ(10, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

     [webView stringByEvaluatingJavaScript:@"scrollBy(0, -10)"];
     [webView waitForNextPresentationUpdate];
     EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
     EXPECT_EQ(0, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

     [webView stringByEvaluatingJavaScript:@"scrollBy(0, 20)"];
     [webView waitForNextPresentationUpdate];
     EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
     EXPECT_EQ(20, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);
 }

 TEST(ScrollViewInsetTests, RestoreInitialContentOffsetAfterNavigation)
 {
     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
     [webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
     [webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];
     [webView stringByEvaluatingJavaScript:@"scrollTo(0, 1000)"];
     [webView waitForNextPresentationUpdate];

     CGPoint contentOffsetAfterScrolling = [webView scrollView].contentOffset;
     EXPECT_EQ(0, contentOffsetAfterScrolling.x);
     EXPECT_EQ(1000, contentOffsetAfterScrolling.y);

     [webView synchronouslyLoadHTMLString:@"<body bgcolor='red'>"];
     [webView waitForNextPresentationUpdate];

     CGPoint contentOffsetAfterNavigation = [webView scrollView].contentOffset;
     EXPECT_EQ(0, contentOffsetAfterNavigation.x);
     EXPECT_EQ(-400, contentOffsetAfterNavigation.y);
 }

 TEST(ScrollViewInsetTests, RestoreInitialContentOffsetAfterCrash)
 {
     auto delegate = adoptNS([[TestNavigationDelegate alloc] init]);
     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
     [webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
     [webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];
     [webView setNavigationDelegate:delegate.get()];

     CGPoint initialContentOffset = [webView scrollView].contentOffset;
     __block CGPoint contentOffsetAfterCrash = CGPointZero;
     __block bool done = false;
     [delegate setWebContentProcessDidTerminate:^(WKWebView *webView) {
         contentOffsetAfterCrash = webView.scrollView.contentOffset;
         done = true;
     }];

     [webView _killWebContentProcessAndResetState];
     Util::run(&done);

     EXPECT_EQ(initialContentOffset.x, contentOffsetAfterCrash.x);
     EXPECT_EQ(initialContentOffset.y, contentOffsetAfterCrash.y);
     EXPECT_EQ(0, initialContentOffset.x);
     EXPECT_EQ(-400, initialContentOffset.y);
 }

 TEST(ScrollViewInsetTests, RestoreInitialContentOffsetAfterCrashWithAsyncPolicyDelegates)
 {
     auto delegate = adoptNS([[AsyncPolicyDelegateForInsetTest alloc] init]);
     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
     [webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
     [webView setNavigationDelegate:delegate.get()];
     delegate->_navigationComplete = false;
     NSURL *testResourceURL = [[[NSBundle mainBundle] bundleURL] URLByAppendingPathComponent:@"TestWebKitAPI.resources"];
     [webView loadHTMLString:veryTallDocumentMarkup baseURL:testResourceURL];
     Util::run(&delegate->_navigationComplete);

     __block bool presentationUpdateHappened = false;
     [webView _doAfterNextPresentationUpdate:^{
         presentationUpdateHappened = true;
     }];
     TestWebKitAPI::Util::run(&presentationUpdateHappened);

     CGPoint initialContentOffset = [webView scrollView].contentOffset;
     __block CGPoint contentOffsetAfterCrash = CGPointZero;
     __block bool done = false;
     [delegate setWebContentProcessDidTerminate:^(WKWebView *webView) {
         contentOffsetAfterCrash = webView.scrollView.contentOffset;
         done = true;
     }];

     [webView _killWebContentProcessAndResetState];
     Util::run(&done);

     EXPECT_EQ(initialContentOffset.x, contentOffsetAfterCrash.x);
     EXPECT_EQ(initialContentOffset.y, contentOffsetAfterCrash.y);
     EXPECT_EQ(0, initialContentOffset.x);
     EXPECT_EQ(-400, initialContentOffset.y);
 }

 TEST(ScrollViewInsetTests, ChangeInsetWithoutAutomaticAdjustmentWhileWebProcessIsUnresponsive)
 {
     constexpr CGFloat initialTopInset = 100;
     constexpr CGFloat updatedTopInset = 70;

     auto scrollViewDelegate = adoptNS([[ScrollViewDelegate alloc] init]);
     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 800, 600)]);
     [webView scrollView].scrollEnabled = NO;
     [webView scrollView].delegate = scrollViewDelegate.get();
     [webView _setObscuredInsets:UIEdgeInsetsMake(initialTopInset, 0, 0, 0)];
     [webView scrollView].contentInset = UIEdgeInsetsMake(initialTopInset, 0, 0, 0);
     [webView synchronouslyLoadTestPageNamed:@"overflow-hidden"];

     UIWindow *window = [webView window];
     [webView evaluateJavaScript:@"setBodyHeight(2000); hangFor(500)" completionHandler:nil];
     [webView removeFromSuperview];

     __block bool done = false;
     dispatch_async(dispatch_get_main_queue(), ^{
         [window addSubview:webView.get()];
         [webView _setObscuredInsets:UIEdgeInsetsMake(updatedTopInset, 0, 0, 0)];
         [[webView scrollView] _setAutomaticContentOffsetAdjustmentEnabled:NO];
         [webView scrollView].contentInset = UIEdgeInsetsMake(updatedTopInset, 0, 0, 0);
         [[webView scrollView] _setAutomaticContentOffsetAdjustmentEnabled:YES];
         done = true;
     });

     TestWebKitAPI::Util::run(&done);
     [webView waitForNextPresentationUpdate];

     EXPECT_EQ(2U, scrollViewDelegate->_contentOffsetHistory.size());
     EXPECT_EQ(-100, scrollViewDelegate->_contentOffsetHistory.first().y);
     EXPECT_EQ(-70, scrollViewDelegate->_contentOffsetHistory.last().y);
     EXPECT_EQ(0, [[webView stringByEvaluatingJavaScript:@"document.scrollingElement.scrollTop"] intValue]);
 }

 TEST(ScrollViewInsetTests, PreserveContentOffsetForRefreshControl)
 {
     auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
     [webView scrollView].refreshControl = adoptNS([[UIRefreshControl alloc] init]).get();
     [webView synchronouslyLoadHTMLString:@""];

     [webView scrollView].contentOffset = CGPointMake(0, -100);

     [webView synchronouslyLoadHTMLString:@"<body bgcolor='red'>"];
     [webView waitForNextPresentationUpdate];

     CGPoint contentOffsetAfterNavigation = [webView scrollView].contentOffset;
     EXPECT_EQ(0, contentOffsetAfterNavigation.x);
     EXPECT_EQ(-100, contentOffsetAfterNavigation.y);
 }

 } // namespace TestWebKitAPI

 #endif // PLATFORM(IOS_FAMILY)
	/*
	* Copyright (C) 2018 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#import "config.h"

	#if PLATFORM(IOS_FAMILY)

	#import "PlatformUtilities.h"
	#import "TestNavigationDelegate.h"
	#import "TestWKWebView.h"
	#import "UIKitSPI.h"
	#import <WebKit/WKWebViewPrivate.h>
	#import <wtf/Vector.h>

	@interface ScrollViewDelegate : NSObject<UIScrollViewDelegate> {
	@public Vector<CGPoint> _contentOffsetHistory;
	}
	@end

	@implementation ScrollViewDelegate

	- (void)scrollViewDidScroll:(UIScrollView *)scrollView
	{
	auto contentOffset = scrollView.contentOffset;
	if (_contentOffsetHistory.isEmpty() \|\| !CGPointEqualToPoint(_contentOffsetHistory.last(), contentOffset))
	_contentOffsetHistory.append(contentOffset);
	}

	@end

	@interface AsyncPolicyDelegateForInsetTest : NSObject<WKNavigationDelegate> {
	@public bool _navigationComplete;
	}
	@property (nonatomic, copy) void (^webContentProcessDidTerminate)(WKWebView *);
	@end

	@implementation AsyncPolicyDelegateForInsetTest

	- (void)webView:(WKWebView )webView didFinishNavigation:(WKNavigation )navigation
	{
	_navigationComplete = true;
	}

	- (void)webView:(WKWebView )webView decidePolicyForNavigationAction:(WKNavigationAction )navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
	{
	int64_t deferredWaitTime = 100 * NSEC_PER_MSEC;
	dispatch_time_t when = dispatch_time(DISPATCH_TIME_NOW, deferredWaitTime);
	dispatch_after(when, dispatch_get_main_queue(), ^{
	decisionHandler(WKNavigationActionPolicyAllow);
	});
	}

	- (void)webView:(WKWebView )webView decidePolicyForNavigationResponse:(WKNavigationResponse )navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
	{
	int64_t deferredWaitTime = 100 * NSEC_PER_MSEC;
	dispatch_time_t when = dispatch_time(DISPATCH_TIME_NOW, deferredWaitTime);
	dispatch_after(when, dispatch_get_main_queue(), ^{
	decisionHandler(WKNavigationResponsePolicyAllow);
	});
	}

	- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView
	{
	if (_webContentProcessDidTerminate)
	_webContentProcessDidTerminate(webView);
	}
	@end

	namespace TestWebKitAPI {

	static const CGFloat viewHeight = 500;
	static NSString *veryTallDocumentMarkup = @"<meta name='viewport' content='width=device-width, initial-scale=1'><body style='width: 100%; height: 5000px'>";

	static void waitUntilInnerHeightIs(TestWKWebView *webView, CGFloat expectedValue)
	{
	int tries = 0;
	do {
	Util::sleep(0.1);
	} while ([[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue] != expectedValue && ++tries <= 100);
	}

	TEST(ScrollViewInsetTests, InnerHeightWithLargeTopContentInset)
	{
	auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
	[webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
	[webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];

	[webView stringByEvaluatingJavaScript:@"scrollTo(0, 10)"];
	waitUntilInnerHeightIs(webView.get(), viewHeight);
	EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
	EXPECT_EQ(10, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

	[webView stringByEvaluatingJavaScript:@"scrollBy(0, -10)"];
	waitUntilInnerHeightIs(webView.get(), viewHeight);
	EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
	EXPECT_EQ(0, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

	[webView stringByEvaluatingJavaScript:@"scrollBy(0, 20)"];
	waitUntilInnerHeightIs(webView.get(), viewHeight);
	EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
	EXPECT_EQ(20, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);
	}

	TEST(ScrollViewInsetTests, InnerHeightWithLargeBottomContentInset)
	{
	auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
	[webView scrollView].contentInset = UIEdgeInsetsMake(0, 0, 400, 0);
	[webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];
	[webView stringByEvaluatingJavaScript:@"scrollTo(0, 10)"];
	[webView waitForNextPresentationUpdate];
	EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
	EXPECT_EQ(10, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

	[webView stringByEvaluatingJavaScript:@"scrollBy(0, -10)"];
	[webView waitForNextPresentationUpdate];
	EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
	EXPECT_EQ(0, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);

	[webView stringByEvaluatingJavaScript:@"scrollBy(0, 20)"];
	[webView waitForNextPresentationUpdate];
	EXPECT_EQ(viewHeight, [[webView objectByEvaluatingJavaScript:@"innerHeight"] floatValue]);
	EXPECT_EQ(20, [[webView objectByEvaluatingJavaScript:@"pageYOffset"] floatValue]);
	}

	TEST(ScrollViewInsetTests, RestoreInitialContentOffsetAfterNavigation)
	{
	auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
	[webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
	[webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];
	[webView stringByEvaluatingJavaScript:@"scrollTo(0, 1000)"];
	[webView waitForNextPresentationUpdate];

	CGPoint contentOffsetAfterScrolling = [webView scrollView].contentOffset;
	EXPECT_EQ(0, contentOffsetAfterScrolling.x);
	EXPECT_EQ(1000, contentOffsetAfterScrolling.y);

	[webView synchronouslyLoadHTMLString:@"<body bgcolor='red'>"];
	[webView waitForNextPresentationUpdate];

	CGPoint contentOffsetAfterNavigation = [webView scrollView].contentOffset;
	EXPECT_EQ(0, contentOffsetAfterNavigation.x);
	EXPECT_EQ(-400, contentOffsetAfterNavigation.y);
	}

	TEST(ScrollViewInsetTests, RestoreInitialContentOffsetAfterCrash)
	{
	auto delegate = adoptNS([[TestNavigationDelegate alloc] init]);
	auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
	[webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
	[webView synchronouslyLoadHTMLString:veryTallDocumentMarkup];
	[webView setNavigationDelegate:delegate.get()];

	CGPoint initialContentOffset = [webView scrollView].contentOffset;
	__block CGPoint contentOffsetAfterCrash = CGPointZero;
	__block bool done = false;
	[delegate setWebContentProcessDidTerminate:^(WKWebView *webView) {
	contentOffsetAfterCrash = webView.scrollView.contentOffset;
	done = true;
	}];

	[webView _killWebContentProcessAndResetState];
	Util::run(&done);

	EXPECT_EQ(initialContentOffset.x, contentOffsetAfterCrash.x);
	EXPECT_EQ(initialContentOffset.y, contentOffsetAfterCrash.y);
	EXPECT_EQ(0, initialContentOffset.x);
	EXPECT_EQ(-400, initialContentOffset.y);
	}

	TEST(ScrollViewInsetTests, RestoreInitialContentOffsetAfterCrashWithAsyncPolicyDelegates)
	{
	auto delegate = adoptNS([[AsyncPolicyDelegateForInsetTest alloc] init]);
	auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
	[webView scrollView].contentInset = UIEdgeInsetsMake(400, 0, 0, 0);
	[webView setNavigationDelegate:delegate.get()];
	delegate->_navigationComplete = false;
	NSURL *testResourceURL = [[[NSBundle mainBundle] bundleURL] URLByAppendingPathComponent:@"TestWebKitAPI.resources"];
	[webView loadHTMLString:veryTallDocumentMarkup baseURL:testResourceURL];
	Util::run(&delegate->_navigationComplete);

	__block bool presentationUpdateHappened = false;
	[webView _doAfterNextPresentationUpdate:^{
	presentationUpdateHappened = true;
	}];
	TestWebKitAPI::Util::run(&presentationUpdateHappened);

	CGPoint initialContentOffset = [webView scrollView].contentOffset;
	__block CGPoint contentOffsetAfterCrash = CGPointZero;
	__block bool done = false;
	[delegate setWebContentProcessDidTerminate:^(WKWebView *webView) {
	contentOffsetAfterCrash = webView.scrollView.contentOffset;
	done = true;
	}];

	[webView _killWebContentProcessAndResetState];
	Util::run(&done);

	EXPECT_EQ(initialContentOffset.x, contentOffsetAfterCrash.x);
	EXPECT_EQ(initialContentOffset.y, contentOffsetAfterCrash.y);
	EXPECT_EQ(0, initialContentOffset.x);
	EXPECT_EQ(-400, initialContentOffset.y);
	}

	TEST(ScrollViewInsetTests, ChangeInsetWithoutAutomaticAdjustmentWhileWebProcessIsUnresponsive)
	{
	constexpr CGFloat initialTopInset = 100;
	constexpr CGFloat updatedTopInset = 70;

	auto scrollViewDelegate = adoptNS([[ScrollViewDelegate alloc] init]);
	auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 800, 600)]);
	[webView scrollView].scrollEnabled = NO;
	[webView scrollView].delegate = scrollViewDelegate.get();
	[webView _setObscuredInsets:UIEdgeInsetsMake(initialTopInset, 0, 0, 0)];
	[webView scrollView].contentInset = UIEdgeInsetsMake(initialTopInset, 0, 0, 0);
	[webView synchronouslyLoadTestPageNamed:@"overflow-hidden"];

	UIWindow *window = [webView window];
	[webView evaluateJavaScript:@"setBodyHeight(2000); hangFor(500)" completionHandler:nil];
	[webView removeFromSuperview];

	__block bool done = false;
	dispatch_async(dispatch_get_main_queue(), ^{
	[window addSubview:webView.get()];
	[webView _setObscuredInsets:UIEdgeInsetsMake(updatedTopInset, 0, 0, 0)];
	[[webView scrollView] _setAutomaticContentOffsetAdjustmentEnabled:NO];
	[webView scrollView].contentInset = UIEdgeInsetsMake(updatedTopInset, 0, 0, 0);
	[[webView scrollView] _setAutomaticContentOffsetAdjustmentEnabled:YES];
	done = true;
	});

	TestWebKitAPI::Util::run(&done);
	[webView waitForNextPresentationUpdate];

	EXPECT_EQ(2U, scrollViewDelegate->_contentOffsetHistory.size());
	EXPECT_EQ(-100, scrollViewDelegate->_contentOffsetHistory.first().y);
	EXPECT_EQ(-70, scrollViewDelegate->_contentOffsetHistory.last().y);
	EXPECT_EQ(0, [[webView stringByEvaluatingJavaScript:@"document.scrollingElement.scrollTop"] intValue]);
	}

	TEST(ScrollViewInsetTests, PreserveContentOffsetForRefreshControl)
	{
	auto webView = adoptNS([[TestWKWebView alloc] initWithFrame:CGRectMake(0, 0, 320, viewHeight)]);
	[webView scrollView].refreshControl = adoptNS([[UIRefreshControl alloc] init]).get();
	[webView synchronouslyLoadHTMLString:@""];

	[webView scrollView].contentOffset = CGPointMake(0, -100);

	[webView synchronouslyLoadHTMLString:@"<body bgcolor='red'>"];
	[webView waitForNextPresentationUpdate];

	CGPoint contentOffsetAfterNavigation = [webView scrollView].contentOffset;
	EXPECT_EQ(0, contentOffsetAfterNavigation.x);
	EXPECT_EQ(-100, contentOffsetAfterNavigation.y);
	}

	} // namespace TestWebKitAPI

	#endif // PLATFORM(IOS_FAMILY)