[css-inline] Describe behaviour of initial letters in short paragraphs

Author: dauwhe

css-inline/Overview.bs

@@ -289,7 +289,7 @@ Issue: Handle glyph ink above cap height of font.
 
 <h4 id="short-para-initial-letter">Short paragraphs with initial letters</h4>
 
-A paragraph with an initial letter may have fewer lines of text than the initial letter occupies. The initial letter acts as if it is a float, and the subsequent para must wrap around it.
+A paragraph with an initial letter can have fewer lines of text than the initial letter occupies. In this case, the initial letter’s top alignment is still honored, and its exclusion area continues into any subsequent blocks. This forces the subsequent inline-level content to wrap around the initial letter&mdash;exactly as if that block's text were part of its own containing block. (This is similar to how floats exclude content in subsequent block boxes.)
 
 <figure>
 <img src="initial-letter-short-para.png" alt="short para with initial letter" width="600"/>
@@ -298,7 +298,7 @@ A paragraph with an initial letter may have fewer lines of text than the initial
 
 If the subsequent block starts with an initial letter,
 establishes a new formatting context,
-or specifies 'clear' in the start direction,
+or specifies 'clear' in the initial letter’s containing block’s start direction,
 then it must clear the previous block’s initial letter.
 
 <figure>

css-inline/Overview.html

@@ -365,7 +365,7 @@ <h4 class="heading settled" data-level=2.7.1 id=raised-sunken-caps><span class=s
 
 <h4 class="heading settled" data-level=2.7.2 id=short-para-initial-letter><span class=secno>2.7.2. </span><span class=content>Short paragraphs with initial letters</span><a class=self-link href=#short-para-initial-letter></a></h4>
 
-<p>A paragraph with an initial letter may have fewer lines of text than the initial letter occupies. The initial letter acts as if it is a float, and the subsequent para must wrap around it.</p>
+<p>A paragraph with an initial letter can have fewer lines of text than the initial letter occupies. In this case, the initial letter’s top alignment is still honored, and its exclusion area continues into any subsequent blocks. This forces the subsequent inline-level content to wrap around the initial letter—exactly as if that block’s text were part of its own containing block. (This is similar to how floats exclude content in subsequent block boxes.)</p>
 
 <figure>
 <img alt="short para with initial letter" src=initial-letter-short-para.png width=600>
@@ -374,7 +374,7 @@ <h4 class="heading settled" data-level=2.7.2 id=short-para-initial-letter><span
 
 <p>If the subsequent block starts with an initial letter,
 establishes a new formatting context,
-or specifies <a class=property data-link-type=propdesc href=http://dev.w3.org/csswg/css2/visuren.html#propdef-clear>clear</a> in the start direction,
+or specifies <a class=property data-link-type=propdesc href=http://dev.w3.org/csswg/css2/visuren.html#propdef-clear>clear</a> in the initial letter’s containing block’s start direction,
 then it must clear the previous block’s initial letter.</p>
 
 <figure>