Select an element from the dropdown (top-right) or use the links to open a dedicated test page with instructions.
- Click checkbox by id and verify selected state.
driver.findElement(By.id("element_chk1")).click();
assert driver.findElement(By.id("element_chk1")).isSelected();
Tip: use By.id selectors where possible. IDs used on this page are stable and intended for automated testing.