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I use <font size=+3> and the + is identified as an HTML (syntax) error. This is valid HTML.
Forgot to mention: dev build 211 IBM JDK 1.3
HTML editor support is contained in editor module
*** Issue 12934 has been marked as a duplicate of this issue. ***
Specification says that arguments like +3 or 100% must be in quotation marks. So from this point of view it is syntax error.
Resolved for 3.3.x or earlier, no new info since then -> closing.