Putting symbols in html formatted dynamic textbox

Not sure if this has been discussed before I had a search and couldn’t find much relevant to it. I need to use the % symbol the text but for some reason it’s leaving it out of the text, now the html equivilents involve using the & and of course to flash that symbolises the end of the text so what’s the way round this?

I’ve tried using various forms of hex code etc but it just takes the code literally.