# Mark Up Formatting of Titles & Questions

I edited this question because the OP originally had Al2O3, with no numbers subscripted, instead of Al2O3.

When I reformatted the chemical using

     Al<sub>2</sub>O<sub>3</sub>


The correct formatting appeared in the body of the text but not the title. The title displayed Al<sub>2</sub>O<sub>3</sub>, not Al2O3.

To get the chemical displayed in the title with the numbers subscripted I had to use conventional MathJax formatting,

$\small\sf\{Al_2O_3}$

Does anyone know why using the <sub> </sub> pair will not work in titles?

As discussed on MSE, HTML tags such as <sub> are not rendered in question titles across the network. This has its origin on Stack Overflow, where it would not be more common to want to ask a question about the HTML element itself than to need to use it to format the title.