Quick answer
Attribute values should be in single or double quotes.
HTML Attribute Quotes
Attribute values should be in single or double quotes. Unquoted values can break with spaces or special chars.
Common causes
- Unquoted value.
- Quote mismatch.
How to fix
- Quote all attribute values.
- Use " or ' consistently.
FAQ
- Quotes required?
- Yes for values with space/special.
- Single or double?
- Either; be consistent.
Fix it now
Try in validator (prefill this example)