The real power of hypertext becomes evident when readers have the ability to create links. We shall not here discuss the many advantages of writing hypertext over ordinary writing, except to mention that:
- One never
needs to write something twice, or copy it, as a reference will
do just as well;
- Because data is not copied, it is less likely to be out of date;
- One can represent one's own view of the world, and connect it to other people's data.
Berners-Lee, et al.;
Web: An Information Infrastructure for HighEnergy Physics (select www-for-hep.ps);
Hypertext links are the threads that interconnect the web.
Hypertext was first popularized by
, used by Douglas
, and implemented by Tim Berners-Lee
link is also called a uniform resource locator (URL
and is a
portion of text or graphic that
an associated web address when
click on it. The standard web link
underlining can be turned off and the default colour changed in most browser
Browsers sometimes give graphics with links
a blue border.
When you click on a link it is recorded in your browser's history
file, and then usually changes to a darker blue so you can tell later
if you've already visited it. When your cursor passes over a link, most browsers
display the address of the linked page is shown on
the bottom border of the window. Sometimes you can tell just from the address
or not you want to visit the link.
Navigation of several links across several pages is called surfing.
A link can be to another section of the same page, to another page on the
web site, or to another web page somewhere else on the Internet. When you jump
to a new page, you can go back to the page you came from,
click on another link to jump to a new location.
To be helpful, the cursor turns into a
hand when you pass it over a graphic containing links. Some pictures contain
more than one link, and the x-y position coordinates
of the cursor in the graphic may be displayed on the bottom window border, which
the web site uses to determine which link in the graphic to select.
Sometimes when you click on a link it opens a new window. You can deliberately
open any page in a new window by right-clicking on it and selecting "Open
in new window". You can close or minimize a new page and return to the first
page whenever you wish.