When you develop a web page using Dynamic HTML, your visitors can view new contents without reloading the page, change screen colors with a mouse click and view animations without installing a plug-ins. If this sounds an existing new world, it is, however, only browsers that support style sheets and JavaScript can support DHTML. It specifies how individual objects within web pages (such as images, headings, or other tagged objects) should be available to scripts. DHTML expands on standard HTML by giving you the formatting control of style sheets combined with the interactive capabilities of scripting languages such as Java Script – all rolled into one.
DHTML is a new and emerging technology that has evolved to meet the increasing demand for eye-catching web sites. DHTML combines HTML with cascading style sheets (CSSs) and scripting languages. HTML specifies a web page, elements like table, frame, paragraph, lists etc. Cascading Style Sheets can be used to determine an element size, color, positions and a number of other features. Scripting languages (JavaScript, VBScript) can be used to manipulate the web pages elements to that styles assigned to them can change in response to a user’s input.
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Cascading Style Sheets
Style sheets are powerful mechanism for adding styles (e.g. Fonts, Color Spacing) to web documents. They enforce standard and uniformity throughout a web site and provide numerous attributes to create dynamic effects. With style sheets, text and image formatting properties can be predefined in a single list. HTML elements on a web page can then be bound to the style sheet. The advantages of a style sheet include the ability to make global change to all documents from a single location. Style sheets are said to cascade when they combine to specify the appearance of a page.
Concept Of Class
The control over page design that style sheet gives is simply great. A particular paragraph may need to look different from other paragraphs. It is probably because the contents of the paragraph are in some way different from other paragraphs on the page. Think of question and answer page. Questions in bold, while the answers is in plain text. The appearance of a paragraph is a function of the content of the paragraph.
Style sheets support classes or sets of style changes for a document. A class can be defined to change the style in specific way for any element it is applied to, and classes can be used to identify logical sets of style changes that might different for different HTML elements. The style changes can be applied directly to each HTML element or applied to a part of a document with tags.
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EXTERNAL STYLE SHEETS
External Style Sheets are composed of standard text, which consists of series of entries with a selector and a declaration. The selector indicated the HTML element affected by the propertied in the declaration. The external style sheets are then saved in a file with extension .css, which can be linked to a web page through a tag.
DHML is a new and emerging technology that has evolved to meet the increasing demand for eye catching web sites. DHTML combines HTML with cascading style sheets (CSSs) and scripting languages.
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