Steps to reproduce:
1. Open Content 9.0.2 site in Internet Explorer 11
2. Create a test user > Create a custom role and apply to the user
3. Apply Edit Tab Permission for the custom role to the home page
4. Login as test user > go to Content > Pages > Add Page
5. Type in a name in the Name area and then delete the name until the red "this field is required" appears
6. Open a Word Document and type in a page name > Highlight the word and copy with the mouse right click button.
7. Put your mouse over the Name textbox and right click with your mouse to paste the page name.
Page name should be valid.
Page name is not valid.