font-size is always inherited by default, i.e every html element gets the font-size of the parent element... The following link from W3C site confirms this..
http://www.w3.org/TR/CSS2/propidx.html

font-size relative values are always relative to the font-size of the parent element.
http://www.w3.org/TR/CSS2/fonts.html#value-def-relative-size

If no font-size is specified then the default font size specified by the browser is considered(and this value can be changed by the end user)...

So setting the font-size to relative units should not cause any problems interms of accessiblity or cross browser compatability.

In BC4J all the entities that are created are updatable by default. In some cases, entities have to be readonly. To mark an entity as readonly (or non-updatable), do the following.

• Open the Entity in the design view (i.e open the overview editor)
• Open the property inspector
• In the property inspector expand the "Type" tab.
• There will be a dropdown with the label "Updatable:". Change its value to "false".