fix: shouldExcludeFromA11yTree runs in IE11 (#365)

IE11 returns `undefined` for missing `parentElement`.

Author: briandipalma

src/__tests__/element-queries.js

@@ -385,6 +385,9 @@ test('queryAllByRole returns semantic html elements', () => {
       <h4>Heading 4</h4>
       <h5>Heading 5</h5>
       <h6>Heading 6</h6>
+      <svg role="img">
+        <rect width="100" height="100" />
+      </svg>
       <ol>
         <li></li>
         <li></li>
@@ -429,6 +432,7 @@ test('queryAllByRole returns semantic html elements', () => {
   expect(queryAllByRole('row')).toHaveLength(3)
   expect(queryAllByRole(/rowgroup/i)).toHaveLength(2)
   expect(queryAllByRole(/(table)|(textbox)/i)).toHaveLength(3)
+  expect(queryAllByRole(/img/i)).toHaveLength(1)
 })
 
 test('getAll* matchers return an array', () => {

src/role-helpers.js

@@ -26,7 +26,7 @@ function shouldExcludeFromA11yTree(element) {
   let visibility = computedStyle.visibility
 
   let currentElement = element
-  while (currentElement !== null) {
+  while (currentElement) {
     if (currentElement.hidden === true) {
       return true
     }