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Style may be chosen specifically for a piece of content, see e.g., color; scope of parameters Alternatively, style is specified for CSS selectors, expressed in terms of elements, classes, and ID's.
The Cascading Style Sheets (CSS) specification describes how elements of web pages are displayed by graphical browsers. Section 4 of the CSS1 specification defines a "formatting model" that gives block-level elements—such as p and blockquote—a width and height, and three levels of boxes surrounding it: padding, borders, and margins. [4]
In some cases, it may be desirable to add clickable annotations to an image. The templates Template:Annotated image and Template:Annotated image 4 exist for this purpose. These templates allow wikitext (e.g., regular text, wikilinks, allowed HTML code, references, and other templates) to be included on the image itself. They may also be used to ...
Space/padding Between the id content and the userbox border. This cell padding uses a CSS length value. Unlike the other unit-less values, this must have a CSS length unit such as px or pt. (E.g. id-p = 8px). id-lh Vertical distance between id text lines (line-height). It is recommended to use unit-less numerical values for line-height.
This script and CSS makes the sidebar stay in the same position on the screen as you scroll. This may have undesirable side effects in Chrome; e.g., when viewing a page like the very common.css page you just edited to put this code in, the viewable content will become much shorter, and require vertical scrolling in a frame.
In very brief summary, one hurdle that trips up many people when attempting to add an image to an infobox template is that most internally provide the wiki code that "wraps" the image. Accordingly, you do not usually add the brackets, number of pixels, and other code details you will learn about below, when placing an image in infoboxes ...
Classes are defined in the HTML document (generated by the server or by JavaScript). They are used as selectors in CSS. Learn to use the browser inspectors of Firefox, lE, Chrome or Safari to inspect the webpages. By default much of the CSS and JavaScript resources are processed for efficiency.
For lengthy captions under narrow images, it's probably best to add a heights= parameter to make the images somewhat larger, as the default small size can lead to overly long stacks of caption text. See below. Packed-overlay: This uses <gallery mode=packed-overlay> to produce captions overlaying the bottom of the image. The captions are ...