Updated with comments from kathyw.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index aacbbc5c69fc21bb9bce966bfb13bc485d8f0381..32db241096041d167d9634ed6d3b4cadd3769aba 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -26546,7 +26546,7 @@ class WheelEvent extends MouseEvent native "WheelEvent,MouseWheelEvent,MouseScro
  *
  * ## See also
  *
- * [WindowBase]
+ * * [WindowBase]
  *
  * ## Other resources
  *
@@ -29974,10 +29974,7 @@ class _DataAttributeMap implements Map<String, String> {
 /**
  * An object that can be drawn to a 2D canvas rendering context.
  *
- * This object is either an [ImageElement], [VideoElement], or
- * [CanvasElement].
- *
- * The image drawn to the canvas differs by implementation:
+ * The image drawn to the canvas depends on the type of this object:
  *
  * * If this object is an [ImageElement], then this element's image is
  * drawn to the canvas. If this element is an animated image, then this
@@ -30028,7 +30025,7 @@ abstract class CanvasImageSource {}
  *
  * ## See also
  *
- * [Window]
+ * * [Window]
  *
  * ## Other resources
  *