A pseudo-element is a selector construct which causes a user agent to behave as though it has inserted phantom markup into a document, and then applied styles to that phantom element. This is done in order to allow for styling based on things which do not appear in the document itself, such as styling the first line of an element. Since this phantom markup is represented as an element-like structure, the constructs are called pseudo-element selectors. In CSS, it is required that a pseudo-element in a tactical proficiency for css senior ncoscss protectionselector be placed after the last selector in the overall.
This is a small distinction but one that’s integral to ensuring that your code remains valid.
Many standards advocates tout “the separation of style from structure” as the primary benefit of adopting CSS in your site’s design —and we agree, with a slight qualification. As you’ll see in the coming pages, there never is a true divorce between your markup and your style sheets. Change the structure of the former, and dozens of rules in the latter might become obsolete.
Because your markup and your CSS are quite interrelated, we prefer to think of style as abstracted from structure. Your markup primarily exists to describe your content, that’s true — however, it will always contain some level of presentational information. The degree, however, is entirely up to you. If you so choose, you could easily offload the presentational work onto the XHTML — replete with font elements, tables, and spacer GIFs.
On the other hand, our style sheet can contain rules that determine all aspects of our pages’ design: colors, typography, images, even layout. And if these rules reside in an external style sheet file to which your site’s pages are linked, you can control the visual display of n HTML documents on your site — an appealing prospect not only for day-to-day site updates, but one that will pay off in spades during that next site-wide redesign initiative. Simply by editing a few dozen lines in a centralized style sheet, you can gain unprecedented control over your markup’s presentation.
Now, they simply digest your site’s look-and-feel once, and then browse quickly through lightweight markup on the rest of your pages. And finally, the most obvious benefit is how very simple your markup has become. This will further positively impact your users’ bandwidth, allowing them to download your pages even more quickly. And, of course, this lighter markup will benefit your site in any search engine optimization initiatives you might undertake. If you think it’s easy for you to sift through five lines of an unordered list, just think of how much more search engine robots will love indexing the content in your now-lightweight markup.
Therefore, a pseudo-element selector must come after any pseudo-class selectors.
Values percentage causes the appropriate point within the origin image to be aligned with the appropriate point in the background of the element. The percentage values are used to calculate both points. If one percentage value is given, it is used for both horizontal and vertical axes. If two values are given, the first is used for the horizontal axis, and the second for the vertical.
This should, we hope, make you and your web marketing office very happy.
Because your CSS can reside in that separate file, your users could ostensibly cache your entire site’s user interface after they visit the first page therein. This is quite a departure from the tag soup days of Web design, where users would be forced to re-download bloated markup on each page of our site: nested <table> elements, spacer GIFs, <font> elements, bgcolor declarations, and all.
Thus, for a value of 50%50%, the middle of the origin image is aligned with the middle of the background; for a value of 100%100%, the bottom right corner of the origin image aligns with the bottom right corner of the element background. Percentage values may not be mixed with keywords such as left, but may be mixed with length values.
Defines the offset of the top left corner of the origin image from the top left corner of the background. If one length value is given, it is used for both horizontal and vertical axes. If two values are given, the first is used for the horizontal axis, and the second for the vertical. Length values may be mixed with percentage values, but not with keywords such as top.
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