How to verify an attribute is present in an element using Selenium WebDriver?

Question

I have many radio buttons on my screen. When a radio button is selected, it has an attribute of checked. When the radio button is not selected, the checked attribute is not

Answer 1

Checkboxes can tricky sometimes, because the attribute checked may not be followed by an attribute value.

If you're only concerned with the presence of the attribute, a simple check would look like this:

 boolean hasAttr_css = driver.findElementsByCssSelector("#input_id[checked]").isEmpty();