A way to show animation when URL is loading

[YourFriend]

Hello,
I'm testing a few things with CEF and i have a problem,when a page is loading the DHTML hide and show the derma panel : http://prntscr.com/idkjcy (i excepted it to be like a blank page)
My code is :

concommand.Add("showUrl", function() 
    local frame = vgui.Create( "DFrame" )
    frame:SetSize( ScrW(),ScrH() )
    frame:SetTitle( "My new Derma frame" )
    frame:SetVisible( true )
    frame:SetDraggable( true )
    frame:Center()
    local html = vgui.Create( "DHTML" , frame )
    html:OpenURL("https://ozrp-nhtqsauce.c9users.io/creaperso")
    html:SetSize( ScrW(),ScrH() )
    frame:MakePopup()
end )

My question is : is there a hook called when the page start to load & another one when the loading is finished ? I tried OnBeginLoadingDocument with no success
I also tried to use http.Fetch to save my website body in a variable when the client connect,and use setHTML so i don't have a first loading and so i can handle this problem in JS but i still have a moment when it display the derma even if it's saved in a variable and doesn't have to load an URL

[LoweChaser]

Not sure if they work with CEF, but PANEL/OnChangeTargetURL and PANEL/OnDocumentReady

[YourFriend]

Thanks u

[TheEMP]

I’m pretty sure you need to be using.
DHTML/AddFunction

[Gmod4phun]

Have you tried using Panel/IsLoading ?

[KoffeSwed]

The hook maybe disappers when the function is finished if im right. Probably not just throwing random guesses.

[YourFriend]

It's fine,it worked it just that i didn't noticied the box,thanks btw