First, i want to thanks you all for your answer

Because all the days of this week i have try to understand why the rendered html not appears when i do a "document.getElementById("myBtn").innerText or document.getElementById("myID").innerHTML" and several other JS commands who usually give the whole HTML of the object
And it's exactely the same thing to obtain the rendered html of the page "document.getElementsByTagName('html')[0].innerHTML", "document.getElementsByTagName('html')[0].innerHTML", "document.documentElement.innerHTML", "new XMLSerializer().serializeToString(document.doctype) + document.documentElement.outerHTML" all that return the same html when i right click on the browser page and do "View the source" and not the full rendered html
But in this case impossible, the browser say to me the object not exist when i ask all command about an object inside the flexbox
However it's incredible because the "DOM inspector" F12 have exactely the same behaviour than usually, and all the HTML appears, even in the flexbox
In fact the inspector is the only one to see the rendered html, all the JS commands or other tools not see the Flexbox code"
I have also try puppeter with nodejs, with is "pagecontent" and it's exactely the same thing...nothing, except the div where the Flexbox is

I have try all i have found before disturb the PB forum, and read dozens forum page and nothing works...always the main div of this damned Flexbox
I have also, try all the browser (Safari, FF, Chome, Lynx, Webie, opera, etc ...) and i can't have what i search to do.
In fact, what i want to do is the thing the most simple and logic of the word.....recover the FULL HTML with JS and all the HTML who is display by the browser, and it's impossible
I have also try, run chrome with the option "-dump-dom", then this time i obtain apparently something but i have another problem.
The full HTML than i want to have, is not the first page.
In the first page, it's a complex login/password impossible to send the password, because i have also try WGET with sending Login/Password and the site not recognize it, and i not have better effect with CURL

It's the https site of my bank, and it's normal the protection is at the maximum...
Then when i launch "-dump-dom" i have html, but after....how i can enter the password, mainly with an headless browser, because the "-dump-dom" works only if the browser is invisible...
And i not have found a way for say to the browser to resend the "-dump-dom" another time after he works...
For do that i have try the splendid code of ZIKITRAKE or INFRATEC for read the stdout and relaunch several time chrome, but like i have only one "-dump-dom" by run this is useless
You are going to laugh, but after have try all the nodejs module without effect, also try to create my own addon (and even them in direct writing the full html not give the rendered code)...i have also try before to modify and recompile the FF source code....but there are so much page, i have not found where is the really full html just before it is reading and display
I am desperate then i have thinking to ask in the familly forum, even if it's not PB, because it's the only one forum where the answers is quick and the members really try to help.
And i know that several of the PB members is also strong in web programming
Thanks a lot my friends for your interest at my sad case
