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There are many situations in which your test script may run ahead of the website or application you're testing, resulting in timeouts and a failing test. For example, you may have a dynamic content element that, after a user clicks on it, a loading appears for five seconds. If your script isn't written in such a way as to account for that five second load time, it may fail because the next interactive element isn't available yet. 

The general advice from the Selenium community on how to handle this is to use explicit waits. While you could also use implicit waits, an implicit wait only waits for the appearance of certain elements on the page, while an explicit wait can be set to wait for broader conditions. Selenium guru Dave Haeffner provides an excellent example of why you should use explicit waits on his Elemental Selenium blog

This code sample, from the SeleniumHQ documentation on explicit and implicit waits, shows how you would use an explicit wait in a Python test script. You can check out examples of using explicit waits in other languages in the code sections below it. 

 Python Example of an Explicit Wait from
from selenium import webdriver
from import By
from import WebDriverWait # available since 2.4.0
from import expected_conditions as EC # available since 2.26.0

ff = webdriver.Firefox()
    element = WebDriverWait(ff, 10).until(EC.presence_of_element_located((By.ID, "myDynamicElement")))
 Java Example of an Explicit Wait
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
WebElement myDynamicElement = driver.findElement("myDynamicElement")); 


 C# Example of an Implicit Wait
driver.Url = "http://somedomain/url_that_delays_loading";
IWebElement myDynamicElement = driver.FindElement(By.Id("someDynamicElement"));
 Ruby Example of an Implicit Wait
driver.manage.timeouts.implicit_wait = 10





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