[css-inline] edit equation to calculate drop initial size

Author: dauwhe

css-inline/InitialCapEquation.png

@@ -2307,12 +2307,28 @@ Drop initials are all about alignment. Reference points on the drop cap must ali
 <p>The size of a drop initial is determined by the need to satisfy the required alignment. For an N-line drop initial in a Western script, the cap-height of the letter needs to be (N – 1) times the line-height, plus the cap-height of the surrounding text. Note this height is <b>not</b> the font size of the drop initial.</p>
 
 
-<p>Actually calculating this font size is tricky. Given the font size F of the main text, the line-height L, the number of lines N, and the cap-height of the font c, we find the drop initial font size D to be:</p>
+<p>Actually calculating this font size is tricky. For an N-line drop initial, we find the drop initial font size to be:</p>
 
 
+<figure>
+<img src="InitialCapEquation.png" width="604" alt="Equation to calcuate drop initial font size"/>
+</figure>
+
+<!--
 <pre>
-D = ((N-1) * L + c*F)/c
+Font size of drop cap = ((N-1) * line-height + [cap-height of para] * [font size of paragraph])/[cap-height ratio of drop initial font]
 </pre>
+-->
+
+<!--
+
+<div>
+
+<math display="block"><mrow><mi>Font size of drop initial</mi><mo>=</mo></mrow><mfrac><mrow><mo>(</mo><mi>N</mi><mo>-</mo><mn>1</mn><mo>)</mo><mo>&#x00D7;</mo><mi>line-height</mi><mo>+</mo><mo>(</mo><mi>cap-height ratio of para font</mi><mo>&#x00D7;</mo><mi>font size of para</mi><mo>)</mo></mrow><mrow><mi>cap-height ratio of drop initial font</mi></mrow></mfrac></math>
+</div>
+
+-->
+
 
 A three-line drop initial in Adobe Minion Pro would have a font size of 61.2pt, given 12pt text, 16pt line-height and a cap-height of 651/1000 (from the font’s OS/2 table).
 </div>

css-inline/Overview.bs

@@ -60,7 +60,7 @@
 </p>
   <h1 class="p-name no-ref" id=title>CSS Inline Layout Module Level 3</h1>
   <h2 class="no-num no-toc no-ref heading settled heading" id=subtitle><span class=content>Editor’s Draft,
-    <span class=dt-updated><span class=value-title title=20140724>24 July 2014</span></span></span></h2>
+    <span class=dt-updated><span class=value-title title=20140804>4 August 2014</span></span></span></h2>
   <div data-fill-with=spec-metadata><dl>
 	<dt>This version:
 	<dd><a class=u-url href=http://dev.w3.org/csswg/css-inline/>http://dev.w3.org/csswg/css-inline/</a>
@@ -2435,11 +2435,17 @@ <h3 class="heading settled heading" data-level=3.2 id=DropInitial><span class=se
 <p>The size of a drop initial is determined by the need to satisfy the required alignment. For an N-line drop initial in a Western script, the cap-height of the letter needs to be (N – 1) times the line-height, plus the cap-height of the surrounding text. Note this height is <b>not</b> the font size of the drop initial.</p>
 
 
-<p>Actually calculating this font size is tricky. Given the font size F of the main text, the line-height L, the number of lines N, and the cap-height of the font c, we find the drop initial font size D to be:</p>
+<p>Actually calculating this font size is tricky. For an N-line drop initial, we find the drop initial font size to be:</p>
 
 
-<pre>D = ((N-1) * L + c*F)/c
-</pre>
+<figure>
+<img alt="Equation to calcuate drop initial font size" src=InitialCapEquation.png width=604>
+</figure>
+
+<p></p>
+
+<p></p>
+
 
 <p>A three-line drop initial in Adobe Minion Pro would have a font size of 61.2pt, given 12pt text, 16pt line-height and a cap-height of 651/1000 (from the font’s OS/2 table).
 </div><p></p>