Flag SVG tags as proprietary in HTML 4.01 documents #909
Description
Per some discussion in issue #903, it's been determined that svg tags should be flagged as proprietary in HTML 4.01 documents.
Rationale: the W3C validator does not accept the svg tag in HTML 4.01 documents. According to Wikipedia, SVG 1.0 become an official recommendation in 2001, whereas HTML 4.01 was officially recommended in 1999.