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Index: M

margin-bottom property: 7.3.4. Single-Side Margin Properties
margin-left property: 7.3.4. Single-Side Margin Properties
margin property: 7.3. Margins
margin-right property: 7.3.4. Single-Side Margin Properties
margin-top property: 7.3.4. Single-Side Margin Properties
margins: 7. Boxes and Borders
7.3. Margins
collapsing: 7.3.5. Collapsing Margins
block-level elements: Collapsing vertical margins
floated elements: 7.6.1. Floated Elements
horizontal, noncollapsing: 8.2.2. Horizontal Formatting
value istransparent,which makes sense; if an element doesn't have a defined color,then its background should be transparent so that the background ofits ancestor elements will be visible. Imagine for a moment that thedefault value were something else, such as silver.Then you would always see something along the lines of Figure 6-16. This could be quite a problem, ifthat's how browsers behaved! Fortunately, they don't.

inline elements and: 7.3.7. Margins and Inline Elements
caution with: 7.3.8. Margins: Known Issues
length values and: 7.3.1. Length Values and Margins
negative (see negative margins)
vs. padding: 7.2. Margins or Padding?
percentages and: 7.3.2. Percentages and Margins
replication: 7.3.3. Replicating Values
single side, setting margin for: 7.3.4. Single-Side Margin Properties
table cells and: 1.3.1. Limited Initial Scope
markers: 8.2.3. List Items
8.2.3. List Items
10.4.2. Markers
matching hyphenated values: Matching hyphenated values
matching single attribute values: Matching single attribute values
max-height property: Limiting width and height
max-width property: Limiting width and height
media types: 1.3.1. Limited Initial Scope
10.8. Media Types and @-rules
Microsoft Internet Explorer (see Internet Explorer)
middle alignment: In the middle
millimeters (mm): 3.2.1. Absolute Length Units
min-height property: Limiting width and height
min-max properties: Limiting width and height
min-width property: Limiting width and height
monospace fonts: 5.1. Font Families
multiple pages, using styles on: 1.2.3. Using Your Styles on Multiple Pages

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line-height rules for block-level elements is sothat we don't have to explicitly declare aline-height for all its inline elements, fictionalor otherwise.


The fictional LINE element actually clarifies thebehavior that results from setting line-height ona block-level element. According to theCSS specification, declaring baseline -- that is, if it's animage, a form input, or another replacedelement -- then the bottom of the element is aligned with thebaseline of its parent, as Figure 4-31 shows:

IMG {vertical-align: baseline;}<P>The image found in this paragraph <IMG SRC="dot.gif" ALT="a dot"> has itsbottom edge aligned with the baseline of the paragraph.</P>
Figure 4-31

Figure 4-31. Baseline alignment of an image

browsers. See
Chapter 11, "CSS in Action", for more details.

1.4.4. Actual Styles

H1 {color: maroon;}
BODY {background: yellow;}

After the @import statement in our example, we find some ordinary

XML is platform independent, textual information

Information in an XML document is stored in plain-text. This might seem like a restriction if were thinking of embedding binary information in an XML document. There are several advantages to keeping things plain text. First, it is easy to write parsers and all other XML enabling technology on different platforms. Second, it makes everything very interoperable by staying with the lowest common denominator approach. This is the whole reason the web is so successful despite all its flaws. By accepting and sending information in plain text format, programs running on disparate platforms can communicate with each other. This also makes it easy to integrate new programs on top of older ones (without rewriting the old programs), by simply making the interface between the new and old program use XML.

For example, if you have an address book document stored in an XML file, created on a Mac, that you would like to share with someone who has a PC, you can simply email them the plain text address book XML document. This cant be done with binary encoded information which is totally platform (and program) dependent.

Another example is web enabling legacy systems. It is very feasible to create a Java web ennoblement application server that simply uses the services provided by the underlying legacy system. Instead of rewriting the legacy system, if the system can be made to communicate results and parameters through XML, the new and old system can work together without throwing away a company's investment in the legacy system.

XML is an open standard