Blink and WebKit reject grid-row-end 1 auto.
Edge and Firefox accept grid-row-end 1 auto and serialize it as 1 auto.
Blink and WebKit reject grid-row-end values span 1 auto, span auto 1 and 1 auto span.
Edge and Firefox accept these and serialize all of them as span 1 auto.
Testing with uppercase makes it clear that span is being accepted as a keyword and auto is being accepted as a custom identifier:
http://jsfiddle.net/ericwilligers/meya2q7d/
All browsers reject the following:auto 1span span 1, span 1 span and 1 span span1 span auto, auto 1 span and auto span 1
The relevant grammar for <grid-line> is
<grid-line> =
auto |
<custom-ident> |
[ <integer> && <custom-ident>? ] |
[ span && [ <integer> || <custom-ident> ] ]
Are auto or span permitted as a <custom-ident>?
The custom-ident spec may be relevant:
Note: When designing grammars with
<custom-ident>, the<custom-ident>should always be "positionally unambiguous", so that it’s impossible to conflict with any keyword values in the property.
I don't see a reading of the spec where span 1 auto would be permissible but not span 1 span.
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