You can use HTML attribute validation, to validate any HTML attribute in your app.
To add HTML attribute validation, do the following:

1. Click the "M" ⇒ "Validations" ⇒ 'Validate HTML attribute' step

2. Select the element you want to validate in the AUT
3. Fill in the attribute name and the expected value

4. Click 'OK'

Notes:

• For the expected value you can use regex, for example, 'href' that starts with https will have the following regex: