add missing TextMetrics properties

Author: buntec

dom/src/main/scala/org/scalajs/dom/TextMetrics.scala

@@ -20,4 +20,62 @@ class TextMetrics extends js.Object {
     * current font of the context.
     */
   var width: Double = js.native
+
+  /** Distance parallel to the baseline from the alignment point given by the CanvasRenderingContext2D.textAlign
+    * property to the left side of the bounding rectangle of the given text, in CSS pixels; positive numbers indicating
+    * a distance going left from the given alignment point.
+    */
+  val actualBoundingBoxLeft: Double = js.native
+
+  /** Returns the distance from the alignment point given by the CanvasRenderingContext2D.textAlign property to the
+    * right side of the bounding rectangle of the given text, in CSS pixels. The distance is measured parallel to the
+    * baseline.
+    */
+  val actualBoundingBoxRight: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline attribute to
+    * the top of the highest bounding rectangle of all the fonts used to render the text, in CSS pixels.
+    */
+  val fontBoundingBoxAscent: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline attribute to
+    * the bottom of the bounding rectangle of all the fonts used to render the text, in CSS pixels.
+    */
+  val fontBoundingBoxDescent: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline attribute to
+    * the top of the bounding rectangle used to render the text, in CSS pixels.
+    */
+  val actualBoundingBoxAscent: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline attribute to
+    * the bottom of the bounding rectangle used to render the text, in CSS pixels.
+    */
+  val actualBoundingBoxDescent: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline property to
+    * the top of the em square in the line box, in CSS pixels.
+    */
+  val emHeightAscent: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline property to
+    * the bottom of the em square in the line box, in CSS pixels.
+    */
+  val emHeightDescent: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline property to
+    * the hanging baseline of the line box, in CSS pixels.
+    */
+  val hangingBaseline: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline property to
+    * the alphabetic baseline of the line box, in CSS pixels.
+    */
+  val alphabeticBaseline: Double = js.native
+
+  /** Returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline property to
+    * the ideographic baseline of the line box, in CSS pixels.
+    */
+  val ideographicBaseline: Double = js.native
+
 }