<P> Internet Explorer's "Favorites" (also "Internet Shortcuts") are stored as individual files named with the original link name, and the filename extension ". URL", for example "Home Page. URL" collected in a directory named "Favorites" which may have subdirectories . Bookmark names must be unique within a folder . Each file contains the original URL and Microsoft - specific metadata . Browsers have varying abilities to import and export bookmarks to favorites, and vice versa . </P> <P> Bookmarklets are JavaScript programs stored as bookmarks . The term is a portmanteau of the words bookmark and applet . Bookmarklets are possible because the JavaScript URI scheme allows JavaScript programs to be stored as URIs, which can be stored in bookmarks . Bookmarklets have access to the current page, which they may inspect and change . As such, they can be simple "one - click" tools which add functionality to the browser . Bookmarklets are typically installed by navigating to a web page that links to a JavaScript URI, right - clicking the link, and clicking the bookmark option . </P> <P> Web developer Steve Kangas got the idea from the Netscape JavaScript Guide, and coined the term bookmarklets in 1998 . Brendan Eich, the inventor of JavaScript, explained bookmarklets as follows: </P> <P> They were a deliberate feature in this sense: I invented the javascript: URL along with JavaScript in 1995, and intended that javascript: URLs could be used as any other kind of URL, including being bookmark - able . In particular, I made it possible to generate a new document by loading, e.g. javascript:' hello, world', but also (key for bookmarklets) to run arbitrary script against the DOM of the current document, e.g. javascript: alert (document. links (0). href). The difference is that the latter kind of URL uses an expression that evaluates to the undefined type in JS . I added the void operator to JS before Netscape 2 shipped to make it easy to discard any non-undefined value in a javascript: URL . </P>

What is the big advantage of a bookmark