diff --git a/source b/source
index 7e707d4afb0..b2fabab0e1c 100644
--- a/source
+++ b/source
@@ -60026,12 +60026,18 @@ interface <dfn>CanvasImageData</dfn> {
   void <span data-x="dom-context-2d-putImageData">putImageData</span>(<span>ImageData</span> imagedata, double dx, double dy, double dirtyX, double dirtyY, double dirtyWidth, double dirtyHeight);
 };
 
+enum <dfn>CanvasLineCap</dfn> { "butt", "round", "square" };
+enum <dfn>CanvasLineJoin</dfn> { "round", "bevel", "miter"};
+enum <dfn>CanvasTextAlign</dfn> { "<span data-x="dom-context-2d-textalign-start">start</span>", "<span data-x="dom-context-2d-textalign-end">end</span>", "<span data-x="dom-context-2d-textalign-left">left</span>", "<span data-x="dom-context-2d-textalign-right">right</span>", "<span data-x="dom-context-2d-textalign-center">center</span>" };
+enum <dfn>CanvasTextBaseline</dfn> { "<span data-x="dom-context-2d-textbaseline-top">top</span>", "<span data-x="dom-context-2d-textbaseline-hanging">hanging</span>", "<span data-x="dom-context-2d-textbaseline-middle">middle</span>", "<span data-x="dom-context-2d-textbaseline-alphabetic">alphabetic</span>", "<span data-x="dom-context-2d-textbaseline-ideographic">ideographic</span>", "<span data-x="dom-context-2d-textbaseline-bottom">bottom</span>" };
+enum <dfn>CanvasDirection</dfn> { "<span data-x="dom-context-2d-direction-ltr">ltr</span>", "<span data-x="dom-context-2d-direction-rtl">rtl</span>", "<span data-x="dom-context-2d-direction-inherit">inherit</span>" };
+
 [NoInterfaceObject, Exposed=(Window,Worker)]
 interface <dfn>CanvasPathDrawingStyles</dfn> {
   // line caps/joins
   attribute unrestricted double <span data-x="dom-context-2d-lineWidth">lineWidth</span>; // (default 1)
-  attribute DOMString <span data-x="dom-context-2d-lineCap">lineCap</span>; // "butt", "round", "square" (default "butt")
-  attribute DOMString <span data-x="dom-context-2d-lineJoin">lineJoin</span>; // "round", "bevel", "miter" (default "miter")
+  attribute <dfn>CanvasLineCap</dfn> <span data-x="dom-context-2d-lineCap">lineCap</span>; // (default "butt")
+  attribute <dfn>CanvasLineJoin</dfn> <span data-x="dom-context-2d-lineJoin">lineJoin</span>; // (default "miter")
   attribute unrestricted double <span data-x="dom-context-2d-miterLimit">miterLimit</span>; // (default 10)
 
   // dashed lines
@@ -60044,9 +60050,9 @@ interface <dfn>CanvasPathDrawingStyles</dfn> {
 interface <dfn>CanvasTextDrawingStyles</dfn> {
   // text
   attribute DOMString <span data-x="dom-context-2d-font">font</span>; // (default 10px sans-serif)
-  attribute DOMString <span data-x="dom-context-2d-textAlign">textAlign</span>; // "start", "end", "left", "right", "center" (default: "start")
-  attribute DOMString <span data-x="dom-context-2d-textBaseline">textBaseline</span>; // "top", "hanging", "middle", "alphabetic", "ideographic", "bottom" (default: "alphabetic")
-  attribute DOMString <span data-x="dom-context-2d-direction">direction</span>; // "ltr", "rtl"<!--, "auto"-->, "inherit" (default: "inherit")
+  attribute <dfn>CanvasTextAlign</dfn> <span data-x="dom-context-2d-textAlign">textAlign</span>; // (default: "start")
+  attribute <dfn>CanvasTextBaseline</dfn> <span data-x="dom-context-2d-textBaseline">textBaseline</span>; // (default: "alphabetic")
+  attribute <dfn>CanvasDirection</dfn> <span data-x="dom-context-2d-direction">direction</span>; // (default: "inherit")
 };
 
 [NoInterfaceObject, Exposed=(Window,Worker)]
@@ -60923,10 +60929,8 @@ idea from Mihai:
   data-x="">butt</code>", "<code data-x="">round</code>", and "<code
   data-x="">square</code>".</p>
 
-  <p>On getting, it must return the current value. On setting, if the new value is one of the
-  literal strings "<code data-x="">butt</code>", "<code data-x="">round</code>", and "<code
-  data-x="">square</code>", then the current value must be changed to the new value; other values
-  must ignored, leaving the value unchanged.</p>
+  <p>On getting, it must return the current value. On setting, the current value must be changed
+  to the new value.</p>
 
   <p>When the object implementing the <code>CanvasPathDrawingStyles</code> interface is created, the
   <code data-x="dom-context-2d-lineCap">lineCap</code> attribute must initially have the value
@@ -60938,10 +60942,8 @@ idea from Mihai:
   of corners that UAs will place where two lines meet. The three valid values are
   "<code data-x="">bevel</code>", "<code data-x="">round</code>", and "<code data-x="">miter</code>".</p>
 
-  <p>On getting, it must return the current value. On setting, if the new value is one of the
-  literal strings "<code data-x="">bevel</code>", "<code data-x="">round</code>", and "<code
-  data-x="">miter</code>", then the current value must be changed to the new value; other values
-  must be ignored, leaving the value unchanged.</p>
+  <p>On getting, it must return the current value. On setting, the current value must be changed
+  to the new value.</p>
 
   <p>When the object implementing the <code>CanvasPathDrawingStyles</code> interface is created, the
   <code data-x="dom-context-2d-lineJoin">lineJoin</code> attribute must initially have the value
@@ -61384,40 +61386,22 @@ transform. ack Shaun Morris. -->
   interpreted relative to the normal-weight 10px sans-serif default.</p>
 
   <p>The <dfn><code data-x="dom-context-2d-textAlign">textAlign</code></dfn> IDL attribute, on
-  getting, must return the current value. On setting, if the value is one of <code
-  data-x="dom-context-2d-textAlign-start">start</code>, <code
-  data-x="dom-context-2d-textAlign-end">end</code>, <code
-  data-x="dom-context-2d-textAlign-left">left</code>, <code
-  data-x="dom-context-2d-textAlign-right">right</code>, or <code
-  data-x="dom-context-2d-textAlign-center">center</code>, then the value must be changed to the new
-  value. Otherwise, the new value must be ignored. When the object implementing the
-  <code>CanvasTextDrawingStyles</code> interface is created, the <code
-  data-x="dom-context-2d-textAlign">textAlign</code> attribute must initially have the value <code
-  data-x="dom-context-2d-textAlign-start">start</code>.</p>
+  getting, must return the current value. On setting, the current value must be changed to the new
+  value. When the object implementing the <code>CanvasTextDrawingStyles</code> interface is
+  created, the <code data-x="dom-context-2d-textAlign">textAlign</code> attribute must initially
+  have the value <code data-x="dom-context-2d-textAlign-start">start</code>.</p>
 
   <p>The <dfn><code data-x="dom-context-2d-textBaseline">textBaseline</code></dfn> IDL attribute, on
-  getting, must return the current value. On setting, if the value is one of <code
-  data-x="dom-context-2d-textBaseline-top">top</code>, <code
-  data-x="dom-context-2d-textBaseline-hanging">hanging</code>, <code
-  data-x="dom-context-2d-textBaseline-middle">middle</code>, <code
-  data-x="dom-context-2d-textBaseline-alphabetic">alphabetic</code>, <code
-  data-x="dom-context-2d-textBaseline-ideographic">ideographic</code>, or <code
-  data-x="dom-context-2d-textBaseline-bottom">bottom</code>, then the value must be changed to the
-  new value. Otherwise, the new value must be ignored. When the object implementing the
-  <code>CanvasTextDrawingStyles</code> interface is created, the <code
-  data-x="dom-context-2d-textBaseline">textBaseline</code> attribute must initially have the value
-  <code data-x="dom-context-2d-textBaseline-alphabetic">alphabetic</code>.</p>
+  getting, must return the current value. On setting, the current value must be changed to the new
+  value. When the object implementing the <code>CanvasTextDrawingStyles</code> interface is
+  created, the <code data-x="dom-context-2d-textBaseline">textBaseline</code> attribute must
+  initially have the value <code data-x="dom-context-2d-textBaseline-alphabetic">alphabetic</code>.</p>
 
   <p>The <dfn><code data-x="dom-context-2d-direction">direction</code></dfn> IDL attribute, on
-  getting, must return the current value. On setting, if the value is one of "<code
-  data-x="dom-context-2d-direction-ltr">ltr</code>", "<code
-  data-x="dom-context-2d-direction-rtl">rtl</code>", <!--"<code
-  data-x="dom-context-2d-direction-auto">auto</code>",--> or "<code
-  data-x="dom-context-2d-direction-inherit">inherit</code>", then the value must be changed to the
-  new value. Otherwise, the new value must be ignored. When the object implementing the
-  <code>CanvasTextDrawingStyles</code> interface is created, the <code
-  data-x="dom-context-2d-direction">direction</code> attribute must initially have the value "<code
-  data-x="dom-context-2d-direction-inherit">inherit</code>".</p>
+  getting, must return the current value. On setting, the current value must be changed to the new
+  value. When the object implementing the <code>CanvasTextDrawingStyles</code> interface is
+  created, the <code data-x="dom-context-2d-direction">direction</code> attribute must initially
+  have the value "<code data-x="dom-context-2d-direction-inherit">inherit</code>".</p>
 
   </div>