[1] HTML の a 要素および area
要素の coords 属性は、
領域の位置と形を指定します。
[2] 仕様書: HTML 4 IW:HTML4:"struct/objects.html#adef-coords"
[3] この属性の値は %Coords です。
SGML 的には CDATA です。
[4] この属性は省略可能です。
仕様書には明記されていませんが、 area
の場合 shape が default
以外なら必須、 a の場合 default
の場合と画像写像の領域にしない場合以外は必須と思われます。
(そうしなければ意味を成しません。)
[9] XHTML2 では src の大域属性化に伴い
coords 属性も大域属性となりました。
<html xmlns="http://www.w3.org/2002/06/xhtml2">
<head>
<title>The cool site!</title>
</head>
<body>
<p src="navbar1.png" type="image/png" usemap="#map1">
<map id="map1">
<nl>
<label>Navigate the site:</label>
<li href="guide.html" shape="rect" coords="0,0,118,28">
Access Guide</li>
<li href="shortcut.html" shape="rect" coords="118,0,184,28">
Go</li>
<li href="search.html" shape="circle" coords="184,200,60">
Search</li>
<li href="top10.html" shape="poly" coords="276,0,276,28,100,200,50,50,276,0">
Top Ten</li>
</nl>
</map>
</p>
</body>
</html> [5]
coords Property (A, AREA) (2007-05-02 10:44:26 +09:00 版) http://msdn2.microsoft.com/en-us/library/ms533695.aspx
(名無しさん)
For
aobjects, you must set the value of this property before you can retrieve it. This satisfies the requirements of World Wide Web Consortium (W3C) Document Object Model (DOM) Level 1 World Wide Web link. The page author is responsible for implementing the functionality defined in HTML 4.0 World Wide Web link foraobjects, if desired.
意味がわからない。 (名無しさん 2007-05-02 01:49:01 +00:00)
[7]
Re: Image maps: should we drop <a coords="">? (Ian Hickson 著, 2007-08-06 21:22:19 +09:00 版) http://permalink.gmane.org/gmane.org.w3c.whatwg.discuss/11585
Regarding <a coords="">, I don't think it's used any more now than when I decided not to include it in HTML5, so I'm still of the opinion that not including it is a good thing.
[8] The SMIL 3.0 Linking Modules ( 版) http://www.w3.org/TR/2008/REC-SMIL3-20081201/smil-extended-linking.html#adef-coords
[11] [whatwg] Image maps: should we drop <a coords="">? ( ( 版)) http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2005-April/003508.html
[12] Revamp coords parsing to be more compatible and less insane · whatwg/html@ead6cfe ( 版) https://github.com/whatwg/html/commit/ead6cfe392d338b66ed85fa84855061fd0990431
Type: Array<number>
The format of this attribute depends on the value of the type and follows the w3 AREA coords specification found at http://www.w3.org/TR/REC-html40/struct/objects.html#adef-coords.
The coords attribute is an array of integers that specify the pixel position of the shape relative to the top-left corner of the target image. The coordinates depend on the value of type as follows:
- circle: coords is [x1,y1,r] where x1,y2 are the coordinates of the center of the circle, and r is the radius of the circle.
- poly: coords is [x1,y1,x2,y2...xn,yn] where each x,y pair contains the coordinates of one vertex of the polygon.
- rect: coords is [x1,y1,x2,y2] where x1,y1 are the coordinates of the upper-left corner of the rectangle and x2,y2 are the coordinates of the lower-right coordinates of the rectangle.
[14] Editorial: always state invalid value default (GloverDonovan著, ) https://github.com/whatwg/html/commit/7e941ae96b264d4743ea0afac00c3b3209ab0cde