Close icon in custom modal popup windows are missing in Internet Explorer 11

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP SP1, Master
• Fix Version/s: 7.0.0 DXP FP8, 7.0.0 DXP SP2, 7.0.3 CE GA4, 7.1.X, Master
• Component/s: Frontend Infrastructure > Utilities
• Labels:
  • liferay-digital-enterprise-70-sp2
  • liferay-fixpack-de-8-7010
• Branch Version/s:
  7.0.x
• Backported to Branch:
  Committed
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/44274

Description:
The close icon in custom modal popup windows are missing in Internet Explorer, and this seems to happen for guest users, with the search portlet permissions removed. To test this, we have a Javascript call that you can run in the Internet Explorer console to create a modal popup window.

Steps to reproduce:
1) Start up DXP and add a new public page, page 2.
2) Remove the guest View permissions on the search portlet.
3) Log out of the portal.
4) Go to http://localhost:8080/web/guest/page-2 in the browser (to ensure that this page loads from the server and not using SPA).
4) Run the attached script in the Internet Explorer console. (Right click on the page, go to Inspect Element, and use the Console tab. To run the script, click on the Green play button on the bottom right corner.)
Expected behavior:
A modal window will appear, with the "X" icon to close the popup window. (Tested on Chrome)
Actual behavior:
A modal window will appear, but there is no "X" icon to close the popup window. If you click where the icon should be, you can still close the window.

Not reproducible in 7.0.x - 4e29392d06d5db2d9d69098b5b461346870fae86
Not reproducible in Master - 0cd186e90b8dd24cdbd5f942a97702339672b93d