How to add HTML Extras that contain a <script> tag (and allow that script to be executed)? #1010

I'm trying to do similar to #931 but I think I've worked out the general case - is there a way we can add extra HTML code that contains script tags, such that the script can be executed?

Minimum viable demo:

import pytest_html

def test_demo(extras):
    extras.append(pytest_html.extras.html('Before'))
    extras.append(pytest_html.extras.html('<script>alert("Hello, World!");</script>'))
    extras.append(pytest_html.extras.html('After'))

When you load in a web browser, you'll find the <script> tag added between 'Before' and 'After'. However, if you open report.html in a text editor, you find that it isn't inserted into the raw HTML, but rather it's encoded data as part of the data-jsonblob property of <div id="data-container" data-jsonblob="..."> - i.e. the <script> doesn't get executed, because it's inserted dynamically. It appears this is understood behaviour

A bit of experimentation suggested that the createRange method documented here would work, with the disadvantage that the script seems to be executed whenever the row is expanded or collapsed. I achieved this by replacing these lines

            if (format_type === 'html') {
                resultBody.querySelector('.extraHTML').insertAdjacentHTML('beforeend', `<div>${content}</div>`)
            }

with

            if (format_type === 'html') {
                const range = document.createRange()
                const fragment = range.createContextualFragment(content)
                resultBody.querySelector('.extraHTML').appendChild(fragment)
            }

This isn't necessarily the best way to fix this though.