removed mention of icon density (closes #118)

index.html

@@ -122,11 +122,9 @@ <h3>
  "type": "image/webp"
  }, {
  "src": "icon/hd_small",
- "density": "2",
  "sizes": "64x64"
  }, {
  "src": "icon/hd_hi",
- "density": "2",
  "sizes": "128x128"
  }]
 }
@@ -834,42 +832,8 @@ <h2>
  </h2>
  <p>
  Each <dfn>icon object</dfn> represents an icon for an application
- suitable to use at some dimensions and screen density.
+ suitable to use in various contexts (e.g., an application menu).
  </p>
- <section>
- <h3>
- <code>density</code> member
- </h3>
- <p>
- The <dfn title="icon-densitiy">density</dfn> member of an icon is the
- device pixel density for which this icon was designed. The device
- pixel density is expressed as the number of dots per 'px' unit
- (equivalent to a <a href=
- "http://dev.w3.org/csswg//#resolution">dppx</a> as defined in
- [[!css3-values]]). The value is a positive number greater than 0. If
- the developer ommits the value, the user agent assumes the value
- <code>1</code>.
- </p>
- <p>
- The <dfn>steps for processing a density of an icon</dfn> are given by
- the following algorithm. The algorithm thanks an <var>icon</var>
- object as an argument and returns a positive number.
- </p>
- <ol>
- <li>Let <var>value</var> be the result of calling the
- [[\GetOwnProperty]] internal method of <var>icon</var> passing
- "<code>density</code>" as the argument.
- </li>
- <li>Let <var>result</var> be the result of
- parseFloat(<var>value</var>);
- </li>
- <li>If <var>result</var> is <code>NaN</code>, +0, −0, +∞, or −∞, or
- less than 0, return 1.
- </li>
- <li>Return <var>result</var>.
- </li>
- </ol>
- </section>
  <section>
  <h3>
  <code>sizes</code> members