[css-link-params] URL fragments should be consistent with existing SVG fragments

[faceless2]

It's unclear how the format for parameters encoded in a URL are supposed to play with existing URL fragments in SVG.

The current SVG spec lets you combine a timesegment (eg t=10) with (for example) a spacesegment (eg xywh=10,10,20,20 by separating them with an ampersand: test.svg#t=10&xywh=10,10,20,20. The css-linked-params spec is silent on how to combine these existing segment parameters with param(), but presumably we'd use the same model test.svg#t=10&xywh=10,10,20,20&param(--foo%20blue)? The spec could do with specifying this.

Secondly, assuming we go this way it feels inconsistent that if we have multiple parameters, we don't use an ampersand to separate them

• test.svg#t=10&xywh=10,10,20,20&param(--foo%20blue)param(--bar%20red)
• test.svg#t=10&xywh=10,10,20,20&param(--foo%20blue)&param(--bar%20red)

The second one feels more correct to me, but at the moment the spec says no ampersand is used.