How do I pass W3 validation for Google checkout url?

Question

When I do validate the page in W3 validation, I got few errors with below code,

<input type="image" name="Google Checkout" alt="Fast checkout through Google"
src="https://sandbox.google.com/checkout/buttons/checkout.gif?merchant_id=xxxxxxxxx&w=168&h=44&style=white&variant=text&loc=en_US"  />

Errors are as follows,

1. cannot generate system identifier for general entity "w"
2. reference to entity "w" for which no system identifier could be generated
3. general entity "h" not defined and no default entity
4. reference to entity "h" for which no system identifier could be generated
5. general entity "style" not defined and no default entity
6. reference to entity "style" for which no system identifier could be generated
7. general entity "variant" not defined and no default entity
8. reference to entity "variant" for which no system identifier could be generated
9. general entity "loc" not defined and no default entity
10. reference to entity "loc" for which no system identifier could be generated

This is the only errors comes from the URL; is there way to pass W3 validation for this URL.

Answer 1

You need to escape the ampersands ( & ) to their HTML entity counterpart &

New code:

<input type="image" name="Google Checkout" alt="Fast checkout through Google"
src="https://sandbox.google.com/checkout/buttons/checkout.gif?merchant_id=xxxxxxxxx&amp;w=168&amp;h=44&amp;style=white&amp;variant=text&amp;loc=en_US" />