Add support for <canvas> to children

Author: wooorm

lib/handlers/index.js

@@ -45,6 +45,7 @@ exports.bdi = all
 exports.bdo = all
 exports.big = all
 exports.blink = all
+exports.canvas = all
 exports.cite = all
 exports.data = all
 exports.details = all

test/fixtures/canvas/index.html

@@ -0,0 +1,9 @@
+<canvas id="canvas" width="300" height="300">
+  <img src="green-circle.png" alt="A green circle">
+</canvas>
+<script>
+var canvas = document.getElementById('canvas')
+var ctx = canvas.getContext('2d')
+ctx.fillStyle = 'green'
+ctx.fillRect(10, 10, 100, 100)
+</script>

test/fixtures/canvas/index.json

@@ -0,0 +1,3 @@
+{
+  "fragment": true
+}

test/fixtures/canvas/index.md

@@ -0,0 +1 @@
+![A green circle](green-circle.png)