By Craig Cook
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Extra info for Beginning HTML with CSS and XHTML: Modern Guide and Reference
Inline declarations in an element’s style attribute are applied even after embedded style sheets. In addition to author style sheets, every modern graphical web browser has its own built-in style sheet to define the default presentation of various elements. When you view a web page without any of the author’s CSS applied, you’re simply seeing it rendered with the browser style sheet, which comes first in the cascade order so all the author’s styles override those defaults. To complicate matters just a bit further, most web browsers allow the end user to attach their own customized style sheets—known as a user style sheet— which comes second in the cascade order, thus overriding the browser’s default styles but not the author’s.
Should you ever want to update the site in the future—changing all your headings from red to blue, for example—you would need to track down every single heading in every single document to implement that change, a daunting task on a large and complex website. Still, an inline style might be an efficient approach on a few rare occasions, but those occasions are very few and far between, and another solution is always preferable; inline styles should be a last resort only when no other options are available.
An ID can be almost any short text label, but it must be unique within a single document; more than one element cannot share the same identifier. The id attribute cannot contain any punctuation or special characters besides hyphens (-) and underscores (_). The first character in an ID must be a letter; it cannot begin with a numeral or any other character. • style: Specifies CSS properties for the element. This is known as inline styling, which you’ll learn more about later in this chapter. Although the style attribute is valid with most elements, it should almost always be avoided because it mixes presentation with your content.
Beginning HTML with CSS and XHTML: Modern Guide and Reference by Craig Cook