public Header getFrozenHeader() {
        List<HeaderCell> frozenHeaderCells = getFrozenHeaderWebElement().findElements(By.tagName("th")).stream()
                .map(HeaderCell::new)
                .collect(Collectors.toList());

        return new Header(getFrozenHeaderWebElement(), frozenHeaderCells);
    }
Gets the Select All checkbox in the header of the table.

@return the WebElement representing the checkbox
primefaces-selenium/primefaces-selenium-components/src/main/java/org/primefaces/selenium/component/base/AbstractTable.java