Iframe issue in spring boot javascript project

My project Display list of document name with achor tag when i click on anchor tag it hides that list and show iframe on page after that when i want to go back to my list again to view another document i click on browser back button but after clicking on browser back button it should hide ifram which display document and show only list of anchor tab but it is not hides that iframe on single click on browsers back button and when i again press browser back button [ 2nd time] instead of showing earlier list it direct comming out of module Please go through with attached document which contains details description with screeshot if you are ok with java ,javascript , spring boot then please let me know my whatsapp no Milind Joshi :- 9209549535