Bookmarklets are interesting little bits of JavaScript stored as bookmarks. They’ve been around since about 1998 (earlier?), but I’ve never bothered to write one.
Here are a few examples:
Clearing The Browser Cache On iPad
Apple’s knowledge base article on it could be as simple as the following screenshot: Instead, the docs say something like: go to Settings, click the Safari tab, click the big clear cache button, duh. » about 100 words