The most fundamental difference is DOM traversal direction:
| Feature | XPath | CSS Selector |
|---|---|---|
| DOM traversal | Both up (parent) and down (child) | Only downward |
| Parent selection | Yes | No |
| Speed | Slightly slower | Slightly faster |
| Text matching | Yes — text() function | No native support |
| Partial matching | contains(), starts-with() | *=, ^=, $= |
XPath traversing UP to parent (CSS cannot do this):
XPATH
//input[@id=''username'']/parent::div
//input[@id=''username'']/ancestor::form
//label[@for=''email'']/following-sibling::input
CSS goes downward only:
CSS
form input[type=''text'']
div > .submit-btn
Recommendation:
- ✓Use CSS Selector when possible — faster and cleaner
- ✓Use XPath when you need parent traversal or text-based matching