Move away from querySelector and querySelectorAll

src/shared/dom.js

@@ -169,12 +169,15 @@ export function selectOptions(select, value) {
 }
 
 export function selectValue(select) {
-	var selectedOption = select.querySelector(':checked') || select.options[0];
-	return selectedOption && selectedOption.__value;
+  var selectedOption = select.options[select.selectedIndex >= 0 ? select.selectedIndex : 0];
+  return selectedOption && selectedOption.__value;
 }
 
 export function selectMultipleValue(select) {
-	return [].map.call(select.querySelectorAll(':checked'), function(option) {
-		return option.__value;
-	});
+  var values = [];
+	for (var i = 0; i < select.options.length; i += 1) {
+		var option = select.options[i];
+    option.selected && values.push(option.__value);
+  }
+  return values;
 }