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Index: U

U element: 4.1.6. Text Decoration
UA (see user agent)
underlining: 4.1.6. Text Decoration
changing color of: Weird decorations
removing from hyperlinks: 4.1.6. Text Decoration
turned off by browsers: Weird decorations
Uniform Resource Identifier (URI): 3.5. CSS2 Units
Uniform Resource Locators (see URLs)
units: 11.1.3. Case 3: Putting a Magazine Article Online
(see also length units; CSS2 units)
for aural style sheets: 3.5. CSS2 Units
avoiding mixing: 11.1.3. Case 3: Putting a Magazine Article Online
color: 3.6. Summary
universal selector: Universal selector
unordered lists: 7.7.1. Types of Lists
unvisited anchors: 2.4.1. Pseudo-Class Selectors
uppercase text: 4.1.5. Text Transformation
upright text: 5.4.1. Fonts with Style
URI (Uniform Resource Identifier): 3.5. CSS2 Units
URLs (Uniform Resource Locators): 3.4. URLs
HREF attribute and: LINK attributes
referring to in style sheets: 3.4. URLs
specifying for images: 6.2.1. Background Images
user agent (UA): 2.2.2. Grouping Declarations
2.2.2. Grouping Declarations
(see also browsers)
users, selecting alternate style sheets: Alternate style sheets

Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N maroon and BODY elements to have a yellowbackground.

Styles such as these comprise the bulk of any embedded stylesheet -- style rules both simple and complex, short and long. Itwill be only rarely that you have a document where theSTYLE element does not contain any rules.

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straightforward, and you may be wondering why I said things could becomplicated. As it turns out, the complication is that margins canhave negative values.

You'll remember that I said the second-simplest rule ofhorizontal formatting was this: the total of the seven horizontalproperties always equals the width of the parentelement. At first glance, this can be interpreted to mean that anelement can never be wider than its parent's contentarea -- and as long as all properties are zero or greater,area where you must remember that total control over documentappearance is simply not possible. In this case, it's due to acombination of inconsistent operating system settings and thevagaries of human perception, which is an obstacle no computer isgoing to overcome any time soon.

It is left to individual authors to decide what chances they wish totake with using named colors, but at least with the specified sixteencolors, there is some moderate hope of consistency.

the SPAN text (which is set to bebolder) will inherit the value of100 and then evaluate to the next-heaviest face,which is the Bold face and which has a numerical weight of700. Figure 5-11 shows us thevisual result of all this.

Figure 5-11

Figure 5-11. Greater weight will usually confer visual boldness

Let's take this all one step further, and add two more rules,plus some markup, to illustrate how all this works (see Figure 5-12 for the results):

Table 5-2. Hypothetical Weight Assignments for Times

The assignment of the keywords normal andbold is straightforward enough, of course. As forthe numbers, 100 through 300are assigned to the Regular face because there isn't a lighterface available. 400 goes to Regular as expected,but what about 500 ? It is assigned to the Regular(or normal) face because there isn't aMedium face available; thus, it is assigned the same as400. As for the rest, 700 goes