227469 2021-06-28 16:37:57 -0700 JavaScript modules fail to load in XHTML documents 2025-01-02 10:06:32 -0800 1 1 1 Unclassified WebKit DOM Safari 13 All All NEW https://bugs.webkit.org/show_bug.cgi?id=123387 InRadar P2 Normal --- 1 00ff0000red webkit-unassigned cdumez webkit-bug-importer youennf ysuzuki oldest_to_newest 1773265 0 432441 00ff0000red 2021-06-28 16:37:57 -0700 Created attachment 432441 Example file that reveals the bug When attempting to load a JavaScript module file (i.e. <script type="module" src="..." />), in an XHTML document sent with the "application/xhtml+xml" MIME type, the file is not loaded at all. It appears that the XHTML document does not recognize "module" as a supported type? "nomodule" scripts also fail to load, so web applications are unable to provide a reliable fallback due to this bug. 1773301 1 ap 2021-06-28 19:04:47 -0700 Chromium bug: https://bugs.chromium.org/p/chromium/issues/detail?id=717643 1773315 2 ysuzuki 2021-06-28 21:28:56 -0700 Currently WebKit does not support modules in XHTML files. You can use modules in HTML (non-XHTML) pages :) 1774870 3 webkit-bug-importer 2021-07-05 16:38:17 -0700 <rdar://problem/80187406> 2084502 4 gsnedders 2025-01-02 10:06:32 -0800 This is at least in part the same as the defer case, given the HTML spec defines the lazy processing under 'if el has a defer attribute or el's type is "module"' (https://html.spec.whatwg.org/multipage/scripting.html#:~:text=Otherwise%2C%20if%20el%20has%20a%20%20%20%20%20%20defer%20attribute%20or%20el's%20type%20is%20%22module%22:). 432441 2021-06-28 16:37:57 -0700 2021-06-28 16:37:57 -0700 Example file that reveals the bug bug.xhtml application/xhtml+xml 275 00ff0000red PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPGh0bWwgeG1sbnM9Imh0dHA6 Ly93d3cudzMub3JnLzE5OTkveGh0bWwiPgogIDxoZWFkPgogICAgPHRpdGxlPkJ1ZzwvdGl0bGU+ CiAgICA8c2NyaXB0IHR5cGU9Im1vZHVsZSI+CiAgICAgIGNvbnNvbGUubG9nKCJIZWxsbywgd29y bGQhIik7CiAgICA8L3NjcmlwdD4KICA8L2hlYWQ+CiAgPGJvZHk+CiAgICA8cD5DaGVjayB0aGUg YnJvd3NlciBjb25zb2xlIGZvciBsb2dzLjwvcD4KICA8L2JvZHk+CjwvaHRtbD4=