Pring Leetcode question

print-leetcode-question.js

document.getElementsByTagName('body')[0].innerHTML = document.querySelectorAll('.question-description__3U1T')[0].innerHTML;

var css = 'body {line-height:1.2} p { font-size: 11px; margin:0px; padding:0px } pre {font-size:8px; margin:0px; padding:2px 4px} code {font-size:8px}',
    head = document.head || document.getElementsByTagName('head')[0],
    style = document.createElement('style');

style.type = 'text/css';
if (style.styleSheet){
  // This is required for IE8 and below.
  style.styleSheet.cssText = css;
} else {
  style.appendChild(document.createTextNode(css));
}

head.appendChild(style);
window.print()

how many questions:
document.getElementsByTagName('tr').length