226965 2021-06-14 04:42:04 -0700 window.scrollBy misses checking the type of options param 2021-06-15 08:46:51 -0700 1 1 1 Unclassified WebKit WebKit Misc. WebKit Local Build Unspecified Linux RESOLVED INVALID P2 Normal --- 1 zyscoder webkit-unassigned cdumez sam oldest_to_newest 1769352 0 zyscoder 2021-06-14 04:42:04 -0700 Steps to reproduce: (1) Open a tab and navigate to any URL; (2) Open Devtools and run the following code in the Console: ``` window.scrollBy('\u{1a}'); ``` Actual results: This code would be evaluated successfully without any exceptions thrown. Expected results: As https://drafts.csswg.org/cssom-view/#dom-window-scrollby says, the param should be of ScrollToOptions type. Thus a TypeError exception should be thrown for this code. In my test, both Chrome and Firefox would throw exceptions: Chrome: `TypeError: Failed to execute 'scrollBy' on 'Window': cannot convert to dictionary.` Firefox: `Window.scrollBy: Value can't be converted to a dictionary.` 1769812 1 cdumez 2021-06-15 08:44:38 -0700 window.scrollBy('\u{1a}'); gives me a TypeError on Safari 15. This is likely already fixed. 1769814 2 cdumez 2021-06-15 08:46:51 -0700 (In reply to Chris Dumez from comment #1) > window.scrollBy('\u{1a}'); gives me a TypeError on Safari 15. This is likely > already fixed. I recommend trying Safari Technology Preview or Safari 15 beta.