Why a website needs to know what fonts I have installed?
Why a website needs to know my plugins?
Why a website need to know the gazzilion of data points tools like evercookie are uaing to fingerprint users.
I asked for a website. Just give it to me. I will render it if I can. If I can not - too bad for the website.
So it can render the website in an appropriate font, while avoiding unnecessary network downloads.
>Why a website needs to know my plugins?
Plugins used to be used for rendering applets. It made sense to see if you had Flash/Java installed before trying to insert one.
Thankfully, plugins are now going away.
if (!isFontAvailable(font)) {
downloadFont(font);
}