implement pinch to zoom

node_modules/component-closest/test/index.html

@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf8">
+    <title>closest</title>
+    <script src="../build/build.js"></script>
+  </head>
+  <body>
+    <div id="d1">
+      <div id="d2">
+        <div id="d3">hello</div>
+      </div>
+    </div>
+    <script>
+      var closest = require('closest')
+      var d1 = document.querySelector('#d1')
+      var d2 = document.querySelector('#d2')
+      var d3 = document.querySelector('#d3')
+      var d4 = document.querySelector('#d3').cloneNode(true);
+      var text = d3.firstChild;
+      var errors = false;
+
+      assert(closest(d3, '#d2'), d2)
+      assert(closest(d3, '#d3'), d3)
+      assert(closest(d3, '#d3'), d3)
+      assert(closest(d3, '#d1'), d1)
+      assert(closest(d3, '#d1', d2), null)
+      assert(closest(d3, '#d1', d1), d1)
+      assert(closest(d4, 'body'), null)
+      assert(closest(document.documentElement, '*'), document.documentElement);
+      assert(closest(text, '#d1'), d1);
+
+      if (!errors) {
+        console.log('all good!');
+      }
+
+      function assert(el1, el2) {
+        if (el1 !== el2) {
+          errors = true;
+          console.log(new Error().stack)
+        }
+      }
+    </script>
+  </body>
+</html>