It is horrendous and verging on unreadable. Since HTML officially supports no mathematical symbols and no greek alphabet, no Hebrew alphabet and no Cyrillic alphabet, every customary such symbol is written out as a word.
Symbolic juxtaposition is to be understood as usual as multiplication.
Whether the superscript is just that or an exponent is presumed, as usual, to be understood from context. Pixelated graphicals are even more trouble and of less use. If you vomit at reading it, think of how I felt writing it. A text browser such as lynx is suggested. Written this way a substitution program or preprocessor can be written faily easily that will transform the words designating mathematical symbols, Greek Hebrew and Cyrillic letters to their actual printing characters.