How to capture afterprint event from a PDF page? - google-chrome-extension

Question

Why don't the
window.addEventListener('afterprint', (event) => {
console.log('After print');
});
window.onafterprint = (event) => {
console.log('After print');
};
commands work on PDF pages? I made a code to send a message to my background.js after print, the code works perfectly on all chrome pages, but on PDF pages they just don't work, and they don't return any kind of error?
"permissions": ["tabs",
"activeTab",
"nativeMessaging",
"scripting"],
"host_permissions": [
"http://*/*",
"https://*/*"
],
"content_scripts":[
{
"js": ["popup.js"],
"matches": ["<all_urls>"]
}

Answer 1

PDf viewers like Acrobat for browsers or modern replacements like Chromium's (Brave Edge etc.) using inbuilt Foxit Skia extension, are Integrated Standalone Binaries.
Here we can see an alternate one, both files are web url entries, but the principle is EXACTLY the same it is either standalone, plugged-in or integrated.
Left is Windows Trident inbuilt System - - - - - - - Right is Mozilla web browser
What you can note in this case is there is NO pdf print just save as PDF. It is not the fact that there's no print function in this example, to respond it is the fact ALL are secured against outside tampering, as they are running in the clients system.
No feedback at all, once a PDF is in a PDF editor/viewer, rather than the HTML editor we call a browser.