CodeHelp - glossary U & V

See unordered lists.
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Unicode was created in 1991 to include nearly every character from all writing systems in the world. It extends the commonly used ISO 8859-1 character set and was officially adopted within HTML4 to make the Web truly multi-lingual. Any web page can ask the browser to load a Unicode character using the syntax &# and the number of the character, e.g. 982 for pi.
Currently not all browsers support unicode this way. pi = ϖ. There is a True-Type font that contains most of the unicode character set available from BitStream.
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• Absolute and relative
• <base>
• mailto: and email
• opening windows

For solutions to problems validating forms which use Javascript, see the CodeHelp site.
To validate your own HTML (after uploading it to suitable webspace) go to the W3C Validator.
Validation at least ensures that you should not get nasty suprises from visitors viewing your HTML in other browsers.
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Similar to <code> - use to display a program argument or variable. Usually renders in italic.
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Set the initial visibility state of any CSS element in the stylesheet: visibility:visible or hidden. When hidden, the element takes up the same amount of space on the page as when it is visible. Compare with display. Visibility can be changed dynamically using Javascript but remember that IE and Netscape have differing ways of accessing CSS elements through Javascript. The following code shows how to manipulate the visibility of an element with the id ´active´ in IE which was previously declared as hidden.
<script type="text/javascript">
<!--
function show() {active.style.visibility = "visible;"}
// -->
</script>

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