Pure HTML5, CSS3, and JavaScript (often using Bootstrap or Tailwind).
You cannot just upload to ThemeForest and pray. You have 30 days for your "new item" boost. Use it. Pure HTML5, CSS3, and JavaScript (often using Bootstrap
ThemeForest has notoriously strict submission requirements. To pass the review process, your code must be: W3C Valid: No errors in your HTML/CSS. Pure HTML5, CSS3, and JavaScript (often using Bootstrap