If you ask them to use another browser some of them will; so I argue is less than 10%. As a side-note "document.querySelectorAll" is supported by IE8, but unfor

If you ask them to use another browser some of them will; so I argue is less than 10%. As a side-note "document.querySelectorAll" is supported by IE8, but unfortunately it doesn't have Array.prototype.filter nor other basic array methods.