[fix] Clipboard browser support

Safari 10.3 supports copying (but apparently not from inputs)

src/apis/Clipboard/index.js

@@ -1,19 +1,43 @@
+/* global window */
+
 class Clipboard {
+  static isSupported() {
+    return (
+      typeof document.queryCommandSupported === 'function' && document.queryCommandSupported('copy')
+    );
+  }
+
   static getString() {
     return Promise.resolve('');
   }
 
   static setString(text) {
     let success = false;
-    const textField = document.createElement('textarea');
-    textField.innerText = text;
-    document.body.appendChild(textField);
-    textField.select();
+
+    // add the text to a hidden node
+    const node = document.createElement('span');
+    node.textContent = text;
+    node.style.position = 'absolute';
+    node.style.opacity = '0';
+    document.body.appendChild(node);
+
+    // select the text
+    const selection = window.getSelection();
+    selection.removeAllRanges();
+    const range = document.createRange();
+    range.selectNodeContents(node);
+    selection.addRange(range);
+
+    // attempt to copy
     try {
       document.execCommand('copy');
       success = true;
     } catch (e) {}
-    document.body.removeChild(textField);
+
+    // remove selection and node
+    selection.removeAllRanges();
+    document.body.removeChild(node);
+
     return success;
   }
 }