XUL was created by Netscape employees for Netscape's XPToolkit project¹. I didn't think that saying that "Mozilla² adopted XUL" would be considered controversial or somehow denigrating, so apologies if if came off that way.
AOL acquired Netscape in 1999, then became the first company to ship XUL as part of Netscape 6 in 2000. https://en.wikipedia.org/wiki/Netscape_6#:~:text=With%20publ... AOL abandoned XUL to the Mozilla open source community not long after, when they disbanded the Netscape team in 2003.²
> Also, would you please provide names for those many pre-XUL XML-based UI languages I'm genuinely curious.
WML, XFDL, and Glade XML all shipped in 1998, two years before Netscape 6. Adobe's XFA also shipped before Netscape 6.
AOL acquired Netscape in 1999, then became the first company to ship XUL as part of Netscape 6 in 2000. https://en.wikipedia.org/wiki/Netscape_6#:~:text=With%20publ... AOL abandoned XUL to the Mozilla open source community not long after, when they disbanded the Netscape team in 2003.²
> Also, would you please provide names for those many pre-XUL XML-based UI languages I'm genuinely curious.
WML, XFDL, and Glade XML all shipped in 1998, two years before Netscape 6. Adobe's XFA also shipped before Netscape 6.
¹ https://www-archive.mozilla.org/xpfe/whoswho ² at the time meaning, "the software suite formerly known as Netscape Communicator" ³ https://www.mentalfloss.com/article/502789/day-2003-netscape...