the only things i know of that you have to worry about with the website world, is never using copyrighted images, or images that aren't of your own pure creation (Every single last layer is of your own making) and the same with fonts.

also there have been issues with a company representing blind people and people with less than good vision going around sueing website makers for not having websites that work with text to speech programs. to get round this, when writing my webpages, i just copied every single piece of text, put them into a basically divided page (cross page lines) with titles for each page above them, and then bracket marked sections to represent images , like so -

( there is an image of ...... )

and then continued with the text. quite simple, and only added about 3 minutes to my website pages after i had the basic code written in. just a matter of copying and pasting into this document, and linking it from the main page. that way, whatever i write was available for txt2speech users. sure it wouldnt be exciting, but how can a website be when youre using t2s? i never questioned how a blind person manages to navigate using a mouse or HID other than a braille kb, but to keep them happy, boring text pages were made.