Many people assumes that single quote is invalid (including me) but seeing different answers on this regards seems we can use single quote for html attributes.
But when I tested writing a page with single quote attribute for the html I found browsers rendering double quotes for the html attributes(by inspecting).
So, there might be slow on complex website because it renders html correctly after replacing single quote to double quote.
What is your final decision to write single quote vs double quote.
This question is merely opinion based question but I've asked this question because many will benefit from this if it really useful not to use single quote?