Adobe Dreamweaver CS3 Manual do Utilizador descarregar pdf (Página 229)

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DREAMWEAVER CS3

User Guide

222

Set the HTML Appearance page properties

The HTML Appearance Page Properties category lets you specify several basic page layout options for your web

pages:

Background Image and Background Specify a background image and background color for the page.

Text and Links Define default colors for text, links, visited links, and active links. You can also control these colors

using CSS style sheets.

Left Margin and Top Margin Specify the sizes of page margins in the body tag, for Microsoft Internet Explorer only.

Netscape Navigator ignores these values, using Margin Width and Margin Height instead. For best cross-browser

results, provide margin values for both browsers instead of just one browser; fill in all four margin values instead of

just two. To ensure that no margins appear in either browser, set all four values to 0. Dreamweaver doesn’t display

page margins in the Document window; to see the margins, use Preview In Browser.

Margin Width and Margin Height Specify the sizes of page margins in the body tag, for Netscape Navigator only.

Internet Explorer ignores these values, using Left Margin and Top Margin instead. For best cross-browser results,

provide margin values for both browsers instead of just one browser; fill in all four margin values instead of just two.

To ensure no margins in both browsers, set all four values to 0. Dreamweaver doesn’t display page margins in the

Document window; use Preview In Browser to see the margins.

See also

“Apply, remove, or rename class styles” on page 136

“About setting page properties” on page 214

“Specify HTML instead of CSS” on page 221

Web-safe colors

In HTML, colors are expressed either as hexadecimal values (for example, #FF0000)orascolornames(red). A web-

safe color is one that appears the same in Netscape Navigator and Microsoft Internet Explorer on both Windows and

Macintosh systems when running in 256-color mode. The conventional wisdom is that there are 216 common colors,

and that any hexadecimal value that combines the pairs 00, 33, 66, 99, CC, or FF (RGB values 0, 51, 102, 153, 204,

and 255, respectively) represents a web-safe color.

Testing, however, reveals that there are only 212 web-safe colors rather than a full 216, because Internet Explorer on

Windows does not correctly render the colors #0033FF (0,51,255), #3300FF (51,0,255), #00FF33 (0,255,51), and

#33FF00 (51,255,0).

When web browsers first made their appearance, most computers displayed only 265 colors (8 bits per channel (bpc).

Today, the majority of computers display thousands or millions of colors (16- and 32-bpc), so the justification for

using the browser-safe palette is greatly diminished if you are developing your site for users with current computer

systems.

Onereasontousetheweb-safecolorpaletteisifyouaredevelopingforalternativewebdevicessuchasPDAandcell

phone displays. Many of this devices offer only black and white (1-bpc) or 256 color (8-bpc) displays.

The Color Cubes (default) and the Continuous Tone palettes in Dreamweaver use the 216-color web-safe palette;

selecting a color from these palettes displays the color’s hexadecimal value.

To select a color outside the web-safe range, open the system color picker by clicking the Color Wheel button in the

upper-right corner of the Dreamweaver color picker. The system color picker is not limited to web-safe colors.

September 4, 2007

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