This issue is especially applicable to northern Indic scripts with a head line.

By and large, Indian scripts in browsers are rendered with default fonts provided by back-end Operating Systems. If there are major differences in physical size for a particular font size, which most of the times are, it shows the mixed-script text in an un-organized way. This obviously affects all the base-line attributes.

Generally, Indian scripts that have joining line use the joining line as the baseline. Ideally, if a document contains both Devanagari and Gurmukhi text (such as Mahan Khosh), the text should be aligned at the joining line regardless of the script or font.