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CSS layout with floated columns and cleared footer, without holy grail features. There were many obstacles to accomplishing this: CSS, although quite useful for styling, had limited capabilities for page layout. The height of block elements (such as div elements) is normally determined by their content.
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
Row headers are identified by ! scope="row" ... CSS to replace obsolete attributes for borders, padding, spacing, etc. ... fixed texts such as units;
mw-collapsible also does not require a header row in the table, as collapsible did. Tables will show the "[hide]" / "[show]" controls in the first row of the table (whether or not it is a header row), unless a table caption is present.(see § Tables with captions) Example with a header row
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.
Sites that use CSS with either XHTML or HTML are easier to tweak so that they appear similar in different browsers (Chrome, Internet Explorer, Mozilla Firefox, Opera, Safari, etc.). Sites using CSS "degrade gracefully" in browsers unable to display graphical content, such as Lynx, or those so very old that they cannot use CSS. Browsers ignore ...
While stuff may work today with only a single use, there are a few reasons why you should add it multiple times: 1) The CSS is 'deduplicated', meaning it only appears once on the page regardless; 2) It is easier for a newbie to learn and associate what's going on with these styles if the template is near to where the table using them is placed ...
This header field is part of HTTP version 1.1, and is ignored by some caches and browsers. It may be simulated by setting the Expires HTTP version 1.0 header field value to a time earlier than the response time. Notice that no-cache is not instructing the browser or proxies about whether or not to cache the content.