def scroll(driver):

driver.execute_script("""

(function () {

var y = document.body.scrollTop;

var step = 100;

window.scroll(0, y);

function f() {

if (y < document.body.scrollHeight) {

y += step;

window.scroll(0, y);

setTimeout(f, 50);

}

else {

window.scroll(0, y);

document.title += "scroll-done";

}

}

setTimeout(f, 1000);

})();

""")