Open
Description
Macros like \ket, \bra and \braket render nicely for the web, but not yet for latex exports. These are found in the braket package on CTAN.
Proposal
Support these macros by default.
Additional notes
These macros are very useful for anyone writing about quantum mechanics. In katex, they are supported by default, but in latex they depend on the braket package. They can be defined in the math object on the frontmatter, but I would suggest adding them by default for improved consistency between the web and pdf builds.