[22]
Mozilla Web Author FAQ http://www.mozilla.org/docs/web-developer/faq.html#accept
The preference for application/xhtml+xml was added to the Accept header in order to enable the serving of MathML to both Mozilla and IE with Apache without scripting back when the MathPlayer plug-in for IE did not handle application/xhtml+xml.
(名無しさん)
[23]
Bug 9677 - [S60] application/xhtml+xml doesn't get XML treatment (2007-01-24 21:54:50 +09:00 版) http://bugs.webkit.org/show_bug.cgi?id=9677
(名無しさん)
[24]
Google (2007-01-24 21:55:56 +09:00 版) http://www.google.com/xhtml
Firefox 1.5 からアクセスすると、
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <meta http-equiv="Cache-Control" content="no-cache"/
(略)
[50] Issue 1347: gmail.com - mobile site is not usable - webcompat.com
( 版)
https://webcompat.com/issues/1347
[51] 1036987 – XML Parsing error: not well-formed when trying to reply to an email through the Gmail web interface on Firefox OS
( 版)
https://bugzilla.mozilla.org/show_bug.cgi?id=1036987
[52] Dev.Opera — No More “XML Parsing Failed” Errors
( 版)
https://dev.opera.com/blog/no-more-xml-parsing-failed-errors/
Over the last couple of years, we've contacted all sites we found are breaking like this, and asked Microsoft to fix the ASP.NET sniffing problem, which they've done. However, as the rollout of this update takes time, there are still a number of sites broken, and it seems like this situation will be with us for quite some time to come.
Hence, we've decided to stop throwing draconian XML parsing failed error messages, and instead, attempt to reparse the document automatically as HTML. Instead of showing an error message in the browser, it's now dumped to the console, so as a developer, you can still find XML parsing error warnings in Opera Dragonfly and the Error Console if you want to.
# [11:38] <annevk> "[T]he reviewer for my registration of application/xhtml+xml in 2014 objected because I was not referring to XHTML 2.0." Thank you darobin, that's comedy gold
# [11:39] <darobin> annevk: :)
# [11:39] <darobin> yeah, MikeSmith and I laughed about that for a while
# [11:39] <darobin> shame the stuff is not public
# [11:39] <darobin> PLH had to stop me from basically strangling them
[66]
Internet Archive(Wayback Machine)で「Content-Type: application/xhtml+xml」なページの表示がエラーになる件とその回避策(12/7対策を確認したので追記) - n2s アーカイブス, https://n2s.hatenadiary.jp/entry/20141203/p1