How can I get the source code of the current page using javascript?

Question:

It is necessary to write the source code of the page (Dom) into the variable as a string. Please tell me how you can implement this?

The source code itself is easiest to get directly from the server (or from the cache):
Unfortunately, this will not work in a snippet.

  fetch(location.href)
    .then(res => res.text())
    .then(res => console.log(res));

If you're interested in the already parsed DOM, there are different ways to get that.

Without <html> :

document.getElementsByTagName('html')[0].innerHTML         
document.documentElement.innerHTML

With html (but without <!doctype ):

document.getElementsByTagName('html')[0].outerHTML         
document.documentElement.outerHTML

Fully:

let html = new XMLSerializer().serializeToString(document);
console.log(html);

<!doctype html>
<html>
  <head><title>Test</title></head>
  <body>
    <h2>Hello, world</h2>
  </body>
</html>
<script>let a = 2;</script>

As you can see, the last <script> ended up inside the body , i.e. we get the result after parsing the browser source code.

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