When an <html> document is present, ensure <head> contains a non-empty <title> so browsers, assistive tech, and search previews can identify the page.
<html>
<head>
<title>Account Settings | ZemDomu</title>
</head>
<body>
<main>...</main>
</body>
</html><html>
<head></head>
<body>
<main>...</main>
</body>
</html>When: An <html> document has no <title>, or <title> exists but is empty
Warning: Document missing non-empty <title> in <head>
Solution: Add a concise, non-empty <title> value in the <head>.