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The second also contains 2 nodenames, but the :hover pseudo class is worth 10, so the combined value of the rule is 12.
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The first rule contains only 2 nodenames, which makes its value 2. The reason that this works, is because of the specificity. Nodenames count as "1", class, pseuo-class and attribute selectors count as "10", and ids as "100". Every CSS rule has a certain importance, which can be determined by simply counting the different elements of a rule. A previously described method was based on the use of extra classnames, but an easier way is to use the specificity of CSS. There is an alternative way to simulate this, using simple descendant selectors only. This is because IE lacks support for the > child selector, which would be perfect to show direct submenus, and not yet the deeper nested ones: Multiple level menus require a different approach though. For instance, if you would remove the javascript from the suckerfish dropdown, described in the A list apart article and add this behavior to the body, it will work. A dual level menusystem is almost too easy to create using this behavior. Read the commented version for more details on this.Ī common use for :hover is creating menusystems using lists. The difference is that 1 and 2 actively searched for affected elements onload of the page (so only once), whereas 3 uses expressions to let nodes do a callback themselves. Unlike versions 1 and 2, version 3 also supports dynamically added html (ajax). This way, :hover, :active and :focus can be supported, and as a developer you don't have to do anything except including the behavior. and finally, set up script events for switching class names.Insert a new rule IE does support, like one with class names,.Search all stylesheets for :hover rules IE doesn't support,.The steps involved in this are something like: These behaviors are linked to html nodes via css, and "enhance" the nodes that are selected by a rule's selector with the given behavior.Ĭombining the above, it should be possible to create a bahavior that searches the styles for rules IE doens't support, and trick affected elements into applying the associated styles some other way. IE also supports so called behaviors both predefined functionality like dynamic content loading or persistent data storage, as well as custom behaviors that you can build into an.
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Fortunately IE recognizes :hover as something it's familiar with, and leaves it alone. Normally, IE returns "unknown" for anything it does not support, for instance a "div p:first-child" would change into "div p:unknown", and a "p a" would be returned as "UNKNOWN" altogether. Note that behavior URLs are relative to the html file, not to the CSS file like a background image URL would be.Īll browsers provide some way to look at a stylesheet's rules using javascript, and dynamically insert new rules. Link whatever:hover to the body element, and you're all set. For some in depth stuff on the other hand, just continue reading.
#Css hover effects w3 download
If you're already familiar with whatever:hover and just want to download it, scroll down and grab the latest version. Version 3 introduces ajax support, meaning that any html that gets inserted into the document via javascript will also trigger :hover, :active and :focus styles in IE. Whatever:hover is a small script that automatically patches :hover, :active and :focus for IE6, IE7 and IE8 quirks, letting you use them like you would in any other browser. IE however, has an erratic support for :hover at best, depending on the particular version your visitor is using. This is cool, because it enables you to, for instance, apply a mouseover effect to table rows using only CSS. Most modern browsers support the :hover selector for any html element. This page (and script) will stay here for old times' sake. And if you really still need to support IE6, don't use :hover for interaction. Please try to convice your client, project manager or boss, that not every browser needs to display a website the exact same way it is the content that matters. Today (oct 2011) it no longer is, and as such this script should not really be necessary anymore. This script is from 2003, and targets a flaw in IE6, which at its peak was a really popuplar browser.