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Index: O

oblique text: 5.4.1. Fonts with Style
octothorpe (#) preceding ID selectors: 2.3.2. ID Selectors
offsets (see side-offset properties)
Opera
CSS implementation in: 1.3.2. Implementations
padding and: 7.5.4. Padding: Known Issues
padding values, negative: 7.5. Padding
operating system, colors and: 10.5.2. Colors
order sorting: 2.8. The Cascade
ordered lists: 7.7.1. Types of Lists
7.7.2. List Item Images
origin image: 6.2.3.3. Length values
origin sorting: 2.8. The Cascade
origins: 2.8. The Cascade
orphans property: 10.8.1. Paged Media
counting, so the basic unit is groups of 16, not the groups of 10 to which we're accustomed. In hexadecimal numbering, the valid digits are 0 through 9 and A through F. Once you've reached F, the next number is 10. Thus, a child learning to count in hex would learn this basic progression:

I realize that it may be a bit weird to think of letters as numbers, but that's how it works in hex. The digits A through F are actually just symbols -- they

outline properties: 10.5.3. Outlines
overflow: 9.1.4. Content Overflow and Clipping
overflow-clip property: 9.1.4.2. Overflow clipping
overflow clipping: 9.1.4.2. Overflow clipping
overflow property: 9.1.4.1. Overflow
overlapping
elements, altering: 9.5. Stacking Positioned Elements
floated elements, preventing: 8.3.1. Floating: The Details
margins (see collapsing margins)
text, preventing: 8.4.3. Managing the Line Height of Inline Elements
overlining: 4.1.6. Text Decoration
overriding previously declared values: 11.1.3. Case 3: Putting a Magazine Article Online


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Figure 8-48

Figure 8-48. Line-box layout with right justification

Again, all we have here are the pieces of a single line of text whichhave been stacked on top of one another with their right sides linedup with each other. If we had set the paragraph to have atext-align of center, then thecenters of the line boxes would have lined up, and if it were set tojustify, then each line box would be forced to beas wide as the paragraph's content area. The difference is madeup in letter- and word-spacing, as we see in Figure 8-49.and the boldfaced text uses TimesBold.

5.2.1. How Weights Work

In order to understand how a user agent determines the heaviness, or weight, of a given font variant, not to mention how weight is inherited, it's easiest to start by talking about the keywords 100 through 900. These number keywords were defined to map to a relatively common feature of fontpadding: 1em;} <P> This is a paragraph which should be visible. Lorem ipsum, dolor sit amet, <EM CLASS="trans">consectetuer adipiscing elit, sed diam nonummy nibh </EM> euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. </P>

Figure 9-14

Figure 9-14. Hiding an element

Everything visible about an element -- such as content, background, and borders -- will be made invisible. Note that the space is still there because the element is still part of the