--- a/master/intro.html	Fri Feb 07 13:48:55 2014 -0600
+++ b/master/intro.html	Fri Feb 07 13:54:17 2014 -0800
@@ -258,11 +258,10 @@
   <dd>A graphics element that is defined by some combination of
   straight lines and curves. Specifically:
   <edit:elementcategory name='shape'/>.</dd>
-
-  <dt id="TermBoundingBox">bounding box</dt>
+  <dt id="TermBoundingBox"><dfn data-dfn-type="dfn" data-noexport id="bounding-box">bounding box</dfn></dt>
   <dd>
-    <p class="issue">Need a definition, which can probably be ported over
-    from SVG Tiny 1.2.</p>
+    <p>A bounding bounding box is the tightest fitting rectangle aligned with the axes of that element's <a>user coordinate system</a> that entirely encloses it and its descendants.</p>
+    <p class="issue">Add detailed defintion of bounding box from SVG 1.2 Tiny.</p>
   </dd>
 
   <dt id="TermCanvas">canvas</dt>
@@ -570,6 +569,12 @@
   of a <a>shape</a> or the outline of
   character glyphs in a text string.</dd>
 
+  <dt id="TermStrokeBoundingBox"><dfn data-dfn-type="dfn" data-noexport id="stroke-bounding-box">stroke bounding box</dfn></dt>
+  <dd>
+    <p>A stroke bounding box is the tightest fitting rectangle aligned with the axes of that element's <a>user coordinate system</a> that entirely encloses it and its descendants including eventual stroke styling under the absence of any specified stroke dashing.</p>
+    <p>See also <a href="coords.html#EstablishingANewUserSpace">Coordinate system transformations</a>.</p>
+  </dd>
+
   <dt id="TermStructuralElement">structural element</dt>
   <dd>The structural elements are those which define the primary
   structure of an SVG document.  Specifically, the following