Is it possible to apply CSS hover effects to this intricate, irregularly shaped link?

I've tried numerous solutions to no avail. My goal is to make my links glow on hover using CSS.

I attempted to use rectangles to link my images, but they are small and overlapping. Can I utilize polygon coordinates in CSS? The main issue I face is that the CSS code for hover effects requires width and height in pixels, while my HTML links have irregular x and y coordinates.

One of the CSS styles I used for hover effects:

/* wiki image glow */
.wikiimageglow 
{ 
    margin-bottom: 10px; 
    width: px; 
    height:px; 
    display:block; 
    background:transparent url('http://cdn.obsidianportal.com/assets/199195/weird4.jpg') center top no-repeat; 
 }

.wikiimageglow:hover 
{ 
    background-image: url('http://cdn.obsidianportal.com/assets/199539/character.jpg');     
}

Here are the links:

<img src="http://cdn.obsidianportal.com/assets/199195/weird4.jpg" width="654" height="690" border="0" usemap="#Map" />
<map name="Map" id="Map">
    <area shape="poly" coords="351,81,386,317,335,295,302,215" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/game-master-information" />
    <area shape="poly" coords="567,202,405,376,390,321,435,243" href="http://www.obsidianportal.com/campaigns/runelords-of-lord-ao/items" />
    <area shape="poly" coords="368,426,403,379,491,365,608,445" href="http://www.obsidianportal.com/campaigns/runelords-of-lord-ao/characters" />
    <area shape="poly" coords="308,430,364,427,430,489,443,628" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/critical-hits-and-misses" />
    <area shape="poly" coords="268,383,305,428,296,514,195,616" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/character-creation" />
    <area shape="poly" coords="279,323,270,378,198,431,53,412" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/adventure-log" />
    <area shape="poly" coords="126,173,332,296,281,321,197,298" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/geography" />
    <area shape="poly" coords="145,530,151,485,199,457,179,507" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/pride" />
    <area shape="poly" coords="109,352,99,318,107,288,139,270,159,305,151,335" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/wrath" />
    <area shape="poly" coords="220,144,232,139,286,143,292,164,254,189,228,185" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/gluttony" />
    <area shape="poly" coords="432,142,463,142,480,152,461,174,415,211,414,174" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/greed" />
    <area shape="poly" coords="524,287,551,302,564,358,535,355" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/sloth" />
    <area shape="poly" coords="520,469,501,506,459,524,463,499,498,472" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/envy" />
    <area shape="poly" coords="323,522,343,562,337,594,328,606,307,578" href="http://www.obsidianportal.com/campaign/runelords-of-lord-ao/wikis/lust" />
</map>
htmlcsshoverhyperlink

Answer №1

While CSS and HTML alone may not solve this particular issue, I've discovered a fantastic jQuery script that does the trick. This script utilizes the map markup and generates canvas elements.

The jQuery plugin Maphilight enhances image maps with visual highlights.

Simply use the jQuery function: $('.foo').maphilight()

It utilizes VML in IE and canvas in other browsers. Maphilight has been successfully tested in Firefox, IE, Safari, Chrome, and Opera.

Important: This script may not be compatible with the latest version of jQuery, but using jquery-migrate resolves this issue.

Check out this JSFIDDLE

Answer №2

In my opinion, the best approach is to use sprites, which involve creating your original image and then having separate hover effects hidden off to the side using CSS. These hover effects can be revealed on mouseover, creating a glowing effect as desired.

Check out this example and this sprite image for reference.

For more information on sprites, be sure to read this article from A List Apart.

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