I have a page title CO2. The title in the nav menu shows it fine but breadcrumb renders the HTML as text CO<sub>2</sub>.

Is there an easy way to fix it?

1 Answer 1


No tags are recognized in a title element by HTML rules (and by browser practice); they are indeed rendered as such. In principle, you can use special characters like “₂” SUBSCRIPT TWO U+2082 in a title element. You can even denote them using character references:


However, only some fonts support SUBSCRIPT TWO, and it is quite possible that the rendering of title elements e.g. in a browser top bar or tab label uses a font that does not support to it. In that case, a rectangle, vertical bar, space, or other generic indicator of missing glyph probably appears.


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