Location of eXIf chunk

Phil Harvey <phil-CIeU6mJ2MbMd166Dz3SrqbDks+cytr/[email protected]> Fri, 9 Jul 2021 15:04:54 -0400

Newsgroups	gmane.comp.graphics.png.general
Message-ID	<[email protected]>

Although the original eXIf specification didn't mandate a location for the eXIf chunk, web developers are advising to ignore the eXIf if it comes after IDAT:

https://github.com/w3c/csswg-drafts/issues/4929

As such, you may want to consider amending the specification to reflect this.  Minimally, it should be recommend to place eXIf before IDAT for web compatibility.  Or possibly requiring it to come before IDAT.

	- Phil Harvey