minify-html
                                
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                        Minify break javascript
<!DOCTYPE html>
<html lang="EN">
<head>
    <meta charset="UTF-8">
    <title>Validation Report</title>
</head>
<body>
<script>
    let collapsibles = document.querySelectorAll('.collapsible');
    for (let collapsible of collapsibles) {
        collapsible.addEventListener('click', function() {
            this.classList.toggle('active');
            let content = this.nextElementSibling;
            if (content.style.display === 'block') {
                content.style.display = 'none';
            }
            else {
                content.style.display = 'block';
                content.scrollIntoView({block: 'nearest'});
            }
        });
    }
</script>
</body>
</html>
minified in python with version 0.15.0
import minify_html
minify_html.minify(html, minify_js=True, remove_processing_instructions=True)
That is minified to:
<!doctypehtml><html lang=EN><meta charset=UTF-8><title>Validation Report</title><body><script>let collapsibles=document.querySelectorAll(`.collapsible`);for(let a of collapsibles){a.addEventListener(`click`,function(){this.classList.toggle(`active`);let a=this.nextElementSibling;if(a.style.display===b){a.style.display=`none`}else{a.style.display=b;a.scrollIntoView({block:`nearest`})}})}</script>
Where the javascript variable names are muddled up and  string block is converted to b.
It worked fine in 0.11.1 before.
This is happening to me as well, and it is breaking certain things for the users of my website.
Edit: not specifically this problem, but it is breaking other Javascript things.