Switch 'illegal-example' to 'illegal example' to match csswg style sheet update

Author: fantasai

css3-syntax/Overview.src.html

@@ -599,7 +599,7 @@ <h3 id="keywords">Keywords</h3>
 
 <p>is not. (It is a string.) Other illegal examples:
 
-<div class="illegal-example"><p>
+<div class="illegal example"><p>
 <pre>
 width: "auto";
 border: "none";
@@ -630,7 +630,7 @@ <h3><dfn>At-rules</dfn></h3>
 at-rule must <span class="index">ignore</span> the whole of the at-rule and continue
 parsing after it.</p>
 
-<div class="illegal-example"><p>
+<div class="illegal example"><p>
 Assume, for example, that a CSS3 parser encounters this style sheet:
 
 <PRE>
@@ -651,7 +651,7 @@ <h3><dfn>At-rules</dfn></h3>
 </PRE>
 </div>
 
-<div class="illegal-example"><p>
+<div class="illegal example"><p>
 In the following example, the second '@import' rule is invalid,
 since it occurs inside a '@media' <a href="#block">block</a>.
 
@@ -679,7 +679,7 @@ <h3><dfn>Blocks</dfn></h3>
 of a string.
 
 
-<div class="illegal-example">
+<div class="illegal example">
 <p> Here is an example of a block. Note that the right brace between
 the double quotes does not match the opening brace of the block, and that the
 second single quote is an <span title="backslash escapes">escaped
@@ -717,7 +717,7 @@ <h3>Rule sets, declaration blocks, and selectors</h3>
 selector, even though the rest of the selector may look reasonable in
 CSS3.
 
-<DIV class=illegal-example>
+<DIV class=illegal example>
 <p>For example, since the "&amp;" is not a valid token in a CSS3
 selector, a CSS3 user agent must
 <span class="index">ignore</span>
@@ -808,7 +808,7 @@ <h3 id="declarations">Declarations and properties</h3>
 name or an invalid value. Every CSS3 property has its own syntactic
 and semantic restrictions on the values it accepts.
 
-<div class="illegal-example"><p>
+<div class="illegal example"><p>
 For example, assume a CSS3 parser encounters this style sheet:
 
 <PRE>
@@ -873,7 +873,7 @@ <h2 id="error-handling">Rules for handling parsing errors or unsupported feature
 href="#declarations">declaration</a> with an unknown
 property. For example, if the style sheet is:
 
-<PRE class="illegal-example">
+<PRE class="illegal example">
 h1 { color: red; rotation: 70minutes }
 </PRE>
 
@@ -886,7 +886,7 @@ <h2 id="error-handling">Rules for handling parsing errors or unsupported feature
 <LI id="illegalvalues"><strong>Illegal values.</strong> User agents must ignore a
 declaration with an illegal value. For example:
 
-<PRE class="illegal-example">
+<PRE class="illegal example">
 img { float: left }       /* correct CSS3 */
 img { float: left here }  /* "here" is not a value of 'float' */
 img { background: "red" } /* keywords cannot be quoted in CSS3 */
@@ -940,7 +940,7 @@ <h2 id="error-handling">Rules for handling parsing errors or unsupported feature
 including the next semicolon (;) or block ({...}), whichever
 comes first. For example, consider the following:
 
-<PRE class="illegal-example">
+<PRE class="illegal example">
 @three-dee {
   @background-lighting {
     azimuth: 30deg;