Friday 31st of October 2014 08:04:20 PM

CSS Style Guide

 

This Style Guide explains the markup and design requirements for web projects, along with various standards and best practices.

projects authored in valid XHTML 1.0 Transitional and styled with valid Cascading Style Sheets will be described here. See the XHTML and CSS sections below for details. Additional sections of this Style Guide, coming soon, will provide information on writing for the web, naming and filing your documents, and other useful topics and guidelines.

XHTML: Guidelines & Benefits

Library projects must be authored in structural XHTML 1.0 Transitional. Page authors should follow accessibility guidelines in compliance with U.S. Law, and so that our site’s content will be made available to the widest possible number of people, browsers, and Internet devices. In addition, all XHTML must validate.

case the weight remains at 900. Thus, you mightencounter the following situations, illustrated in Figure 5-10:

P {font-weight: normal;}P EM {font-weight: bolder;}  /* results in 'bold' text, evaluates to '700' */H1 {font-weight: bold;}H1 B {font-weight: bolder;}  /* if no bolder face exists, evaluates to '800' */P {font-weight: 100;} /* assume 'Light' face exists ; see explanation */P STRONG {font-weight: bolder;} /* results in 'normal' text, weight '400' */
Figure 5-10

Figure 5-10. Text trying to be more bold

XHTML Guidelines
The rules of XHTML as compared to HTML—an easy transition
What is XML?
A brief introduction to the foundation of XHTML
XHTML Benefits
Four key benefits of converting from HTML to XHTML
XHTML Authoring Tips & Tools
Simplifying the work process—includes tips on thinking structurally, and tools for hand-coders and Dreamweaver users
XHTML Accessibility Tips
Making sure your pages can be read by all visitors, browsers, and devices
XHTML Validation
Ensuring interoperability by avoiding errors and sticking to standards

CSS: Style Sheets & Tips

Library projects must use valid Cascading Style Sheets (CSS) to control typography, color, and other layout elements. Style Sheets must be linked in a way that accommodates the capabilities of new and old browsers.

CSS Guidelines
Tips on authoring and linking to Style Sheets
Steal These Style Sheets!
Style Sheets for your use in Library projects
CSS Validation
Ensuring that your Style Sheets are error-free (same as XHTML validation)

A number of valid Style Sheets have been provided for your use. If you wish to create your own Style Sheets, please discuss your requirements with the Branch Library’s Web Coordinator.

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of an element be too much for the element's size, it will be in danger of overflowing the element itself. There are a few alternatives in such situations, and CSS lets you select between them. It will also allow you to define a clipping region to determine the area of the element outside which these sorts of things become an issue, as well as give a way to clip off parts of an element.

9.1.4.1. Overflow

So let's say that you have, for whatever reason, an elementforget to declare a border style. This leads to all kinds of author frustration because at first glance, the styles appear correct. The result, though, is a paragraph with no border:

P {margin: 5px; border-width: 20px;}

Since the default value of border-style is none, failure to declare a style is exactly the same as declaring border-style: none. Therefore, if you want a border to appear, you need to pick a style and declare it.

1. The left (or right) outer edge of a floated element maynot be to the left (or right) of the inner edge of its parentelement.

Straightforward enough. The furthest to the left the outer left edgeof a left-floated element may go is the inner left edge of its parentelement; similarly, the furthest right a right-floated element may gois its parent's inner right edge, as shown in Figure 8-30. (In this and subsequent figures, the circlednumbers show the position where the markup element actually appearsin relation to the source, and the numbered box shows the position