I haven't tested it in different browsers, but yes, this could be a valid workaround, in order to overcome the current limitations.

I'm not sure if I would use this, but this is more because I have already a great working solution for flexible layouts (and yes, I know, I'm not your target group). Nevertheless my hope is, that we will see an alternative export mode (without absolute positioning of content elements) in some months.

Remi

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Disclaimer 1:
I don't use Xara Web Designer, therefore it could be, that my answer may not consider the current features of Xara Web Designer.

Disclaimer 2 (necessary these days):
I'm not implying anything I haven't said.