Sunday 28th of August 2016 04:22:24 AM

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.

XHTML Guidelines
The rules of XHTML as compared to HTML—an easy transition
What is XML?
A brief introduction to the foundation of XHTML
style sheet gets mangled into something unusable. If you find that you're having this problem, then you'll need to contact your ISP and explain the problem. If they refuse to fix it, try explaining to them that IANA (the Internet Assigned Numbers Authority, which also approves MIME types) has approved .css as the extension for the MIME type text/css, and the slideshow mapping is not a recognized IANA MIME type.

If they still refuse to correct the problem, then you may be able to

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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EM {font-style: oblique;}
This is used to set the weight of a font, making it heavier or lighter. The numeric value 400 is equivalent to the value normal, and 700 is equal to bold. Each numeric value is at least as heavy as the next-lower value, and at least as light as the next-higher number.


section to format your page content.  In-line tags are meantto affect short bits of text; block-level tags affect paragraphsor other blocks of text, and typically include automatic line-breaks. You can nest in-line tags within block-level tags and/or other in-linetags, but don't next block-level tags inside in-line tags.  Wheretags let you specify attributes, attribute choices are summarized
 First, note that HTML ignores 
carriage returns            consider this rule:

BODY {font-size: 12pt;}TD {font-size: 80%;}

All it takes is three levels of nesting in your tables, and you endup with 6-point text (12 x 0.8 x 0.8 x 0.8 =6.144). Many complicated pages have at least three levels of nesting,and sometimes even more.

Figure 8-2

Figure 8-2. The complete box model

In general, the width of an element is defined to be the distance from the left inner edge to the right inner edge, and the height is the distance from the inner top to the inner bottom. These are both, not coincidentally, properties that can be applied to an element.

The various widths, heights, padding, margins, and borders all combine to determine how a document is laid out. In most cases, the