211775 2020-05-12 02:45:41 -0700 ITP: 7-Day Cap on All Script-Writable Storage does not seem to be working 2022-02-12 21:01:34 -0800 1 1 1 Unclassified WebKit New Bugs Safari 13 All iOS 13 RESOLVED DUPLICATE 212034 InRadar P2 Normal --- 1 rowan wilander bfulgham webkit-bug-importer wilander oldest_to_newest 1651671 0 399113 rowan 2020-05-12 02:45:41 -0700 Created attachment 399113 A text file containing the HTML, manifest, and third-party script used during testing After the release of iOS 13.4 and Safari 13.1, and the accompanying blog post at https://webkit.org/blog/10218/full-third-party-cookie-blocking-and-more/ , I ran some tests just to verify how much the website and web app I work on would be affected. After reading that blogpost, my expectations were: 1) In Safari [Mobile/Desktop], first and third party script-set cookies should be deleted after 7 days. 2) In Safari [Mobile/Desktop], first and third party script-set localStorage should be deleted after 7 days of Safari use without using those pages. 3) In Web Apps added to the iOS home screen, first and third-party script-set cookies should not be deleted after 7 days if the web app is not launched during that time. 4) In Web Apps added to the iOS home screen, first and third-party script-set localStorage should not be deleted after 7 days if the web app is not launched during that time. 5) In a WKWebView in an app, first and third party cookies and localStorage should persist regardless of usage. I set up some tests on 25th March on my personal iPhone, using domains I was not actively using; visiting a page in Safari, saving it to the homescreen, and navigating a WKWebView to it. (See attached files - very basic implementation of one static HTML page and a manifest on one domain, and a js file on another domain.) I then closed those tabs and did not visit those domains again, but used Safari daily for other tasks. On April 3rd, 9 days later, I navigated to the web page again, launched the web app, and navigated the WKWebView to check the results, which were: 1) In Safari [Mobile/Desktop], first and third party cookies were deleted. This matches expectations. 2) In Safari [Mobile/Desktop], first and third party localStorage still had stored values. I was expecting the localStorage values to have been deleted. 3) In the home screen Web App, first and third party cookies were deleted. This does not match what I was expecting, as https://webkit.org/blog/10218/full-third-party-cookie-blocking-and-more/ says "If your web application does experience website data deletion, please let us know since we would consider it a serious bug." 4) In the home screen Web App, first and third party localStorage still had stored values. This matches expectations but because of (2) and (3) I'm not sure which it's following. 5) In the WKWebView, first and third part cookies and localStorage all still exist. This matches expectations. Because I doubted my results, I then left the installations as they were to re-run the tests. Other things happened, and I only got around to retesting the installations on May 11th, over a month later. The same behaviour was observed - cookies deleted in Safari and home screen, localStorage persisting despite daily (or near-daily) Safari usage. So I think I'm seeing two strange bits of behaviour: a) In the browser, I would have expected localStorage to have been deleted once the 7-day usage counter was reached. This has not happened and localStorage seems to be persisting. Could anything else be causing this? b) In a home screen web app, I would have expected cookies to persist if I was not opening the web app, particularly for the first party domain the web app was for. I would consider this website data deletion. @johnwilander has clarified that cookies use a wall time expiry mechanism rather than a usage counter (https://mobile.twitter.com/johnwilander/status/1259854477047316484) so I wonder if this is the cause of this - and is this intended? It doesn't seem to match what the blog post suggests. Are there other contributing factors that could be affecting this behaviour? 1651672 1 399114 rowan 2020-05-12 03:09:32 -0700 Created attachment 399114 A HTML file to be placed on a domain considered first party and visited as part of the test 1651673 2 399115 rowan 2020-05-12 03:10:54 -0700 Created attachment 399115 A manifest.json file to be placed on the domain considered first party, to allow homescreen installation during testing 1651674 3 399116 rowan 2020-05-12 03:12:01 -0700 Created attachment 399116 A script file to be placed on a different domain considered third-party for testing. 1651706 4 wilander 2020-05-12 06:03:22 -0700 Thanks! Client-side cookies expire based on wall time since they have an explicit expiry function. So that behavior is expected. I will look at what’s going on with other script-writeable storage. 1654662 5 webkit-bug-importer 2020-05-20 15:08:22 -0700 <rdar://problem/63465352> 1840887 6 bfulgham 2022-02-12 21:01:34 -0800 *** This bug has been marked as a duplicate of bug 212034 *** 399113 2020-05-12 02:45:41 -0700 2020-05-12 02:45:41 -0700 A text file containing the HTML, manifest, and third-party script used during testing file_211775.txt text/plain 3354 rowan SVRQVGVzdC5odG1sLCBhIGZpbGUgdG8gYmUgcGxhY2VkIG9uIGEgZG9tYWluIGNvbnNpZGVyZWQg Zmlyc3QgcGFydHk6DQoNCjxodG1sPg0KCTxoZWFkPg0KCQk8dGl0bGU+U3RvcmFnZSBUZXN0PC90 aXRsZT4NCgkJPGxpbmsgcmVsPSJtYW5pZmVzdCIgaHJlZj0ibWFuaWZlc3QuanNvbiI+DQoJCTxt ZXRhIG5hbWU9ImFwcGxlLW1vYmlsZS13ZWItYXBwLWNhcGFibGUiIGNvbnRlbnQ9InllcyI+DQoJ PC9oZWFkPg0KCTxib2R5Pg0KCQk8aDM+SGVsbG8hIFRoaXMgaXMgYSBsaXR0bGUgc3RvcmFnZSB0 ZXN0LjwvaDM+DQoNCgkJPGhyIC8+DQoNCgkJPHA+VGhlIGZpcnN0LXBhcnR5IGNvb2tpZSBleGlz dHM6IDxzdHJvbmcgaWQ9ImNvb2tpZTEiPi4uLjwvc3Ryb25nPi4NCgkJVGhlIGZpcnN0LXBhcnR5 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2020-05-12 03:09:32 -0700 2020-05-12 03:09:32 -0700 A HTML file to be placed on a domain considered first party and visited as part of the test ITPTest.html text/html 1909 rowan PGh0bWw+Cgk8aGVhZD4KCQk8dGl0bGU+U3RvcmFnZSBUZXN0PC90aXRsZT4KCQk8bGluayByZWw9 Im1hbmlmZXN0IiBocmVmPSJtYW5pZmVzdC5qc29uIj4KCQk8bWV0YSBuYW1lPSJhcHBsZS1tb2Jp bGUtd2ViLWFwcC1jYXBhYmxlIiBjb250ZW50PSJ5ZXMiPgoJPC9oZWFkPgoJPGJvZHk+CgkJPGgz PkhlbGxvISBUaGlzIGlzIGEgbGl0dGxlIHN0b3JhZ2UgdGVzdC48L2gzPgoKCQk8aHIgLz4KCgkJ PHA+VGhlIGZpcnN0LXBhcnR5IGNvb2tpZSBleGlzdHM6IDxzdHJvbmcgaWQ9ImNvb2tpZTEiPi4u Ljwvc3Ryb25nPi4KCQlUaGUgZmlyc3QtcGFydHkgY29va2llYWdlIGlzOiA8c3Ryb25nIGlkPSJj b29raWUxYWdlIj4uLi48L3N0cm9uZz4uPC9wPgoKCQk8cD5UaGUgZmlyc3QtcGFydHkgbG9jYWxT dG9yYWdlIGV4aXN0czogPHN0cm9uZyBpZD0ic3RvcmFnZTEiPi4uLjwvc3Ryb25nPi4KCQlUaGUg Zmlyc3QtcGFydHkgbG9jYWxTdG9yYWdlIGFnZSBpczogPHN0cm9uZyBpZD0ic3RvcmFnZTFhZ2Ui Pi4uLjwvc3Ryb25nPi48L3A+CgoJCTxociAvPgoKCQk8cD5UaGUgdGhpcmQtcGFydHkgY29va2ll 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manifest.json application/manifest+json 209 rowan ewoJIm5hbWUiOiAiU3RvcmFnZSB0ZXN0IiwKCSJzaG9ydF9uYW1lIjogIlN0b3JhZ2VUZXN0IiwK CSJkZXNjcmlwdGlvbiI6ICJBIFN0b3JhZ2UgVGVzdCIsCgkibGFuZyI6ICJlbi1HQiIsCgkic3Rh cnRfdXJsIjogIi9JVFBUZXN0Lmh0bWwiLAoJInNjb3BlIjogIi8iLAoJImRpc3BsYXkiOiAic3Rh bmRhbG9uZSIsCgkidGhlbWVfY29sb3IiOiAiIzAwMDAwMCIKfQo= 399116 2020-05-12 03:12:01 -0700 2020-05-12 03:12:01 -0700 A script file to be placed on a different domain considered third-party for testing. thirdparty.js text/javascript 864 rowan dmFyIHRoaXJkUGFydHlDb29raWVWYWx1ZSA9IGRvY3VtZW50LmNvb2tpZS5yZXBsYWNlKC8oPzoo PzpefC4qO1xzKiljb29raWV0aGlyZFxzKlw9XHMqKFteO10qKS4qJCl8Xi4qJC8sICIkMSIpOwoK aWYgKHRoaXJkUGFydHlDb29raWVWYWx1ZSkgewoJZG9jdW1lbnQucXVlcnlTZWxlY3RvcignI2Nv b2tpZTMnKS5pbm5lclRleHQgPSAnWWVzJzsKCWRvY3VtZW50LnF1ZXJ5U2VsZWN0b3IoJyNjb29r aWUzYWdlJykuaW5uZXJUZXh0ID0gbmV3IERhdGUocGFyc2VJbnQodGhpcmRQYXJ0eUNvb2tpZVZh bHVlKSk7Cn0gZWxzZSB7Cglkb2N1bWVudC5xdWVyeVNlbGVjdG9yKCcjY29va2llMycpLmlubmVy 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