Generally speaking, RadRichTextBox's aim is to behave more like Word and less like a browser when opening HTML. In this light, some HTML constructs may be treated differently when imported in the editor in comparison with the way they are shown in a browser. Our policy is to collect specific request for enhancements/fixes when our behavior differs significantly from that of Word, estimate them and schedule them on an individual basis.
Regarding 1, it is an issue indeed, but it is not in the HTML support, but rather in our internal table layouting algorithm - it doesn't support what you see in the browsers/Word. Once we enhance it to support this, the HTML format provider will be modified accordingly, but I can't give you any timeline for this.
About 2. & 2.a) - I'm not sure exactly what your scenario is. You can send us specific HTML+CSS, so we can investigate the cause of the incorrect behavior and schedule it for fixing.
b) This article is the best documentation there is on HTML and CSS support. As they are complex standards, you can further test it with specific samples.
c) Further support for HTML and CSS will be provided for new features, as they come out (if applicable). Fixes and enhancements will be considered depending on the clients' demand.
I hope this answers your questions. Contact us if you have any other ones.
the Telerik team
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