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Browsers cache things they download, so if you look at them again, they don’t have to download all that content again – because normally pages aren’t changing.

When you do make changes to a page, you’ll need to wait a long time, or let the browser know that you would like it to download everything again completely. You do this by “clearing the cache” in the browser.

It’s a bit different in each browser, but if you Google for it, you’ll get good instructions: