Many modern Internet browsers support the capabilty to load webpages in a private mode, that prevents local cache, cookies, logins, and more from affecting how the website loads. This is called Private Browsing, Incognito Mode, InPrivate Windows, and other names.
In Chrome, click the Menu Icon > 'New Incognito Window'. The File menu has this option as well.
In Firefox, click File > 'New Private Window'
In Edge, click the Menu Icon > 'New InPrivate Window'
In Safari, click File Menu > 'New Private Window'