The Katalon Love Story Me: "Katalon, please click the 'Save' button." Katalon: "I cannot find the element." Me: "It's right there! I can see it! It's huge and blue!" Katalon: StepFailedException: Element not visible. Me: Sighs. "Okay, fine." Adds WebUI.delay(5) Me: "How about now?" Katalon: "Oh! THAT button! Why didn't you say so earlier? Clicked." Me: "Okay, now verify the text 'Rev Vibe' is on the screen." Katalon: "Error. Text not found." Me: "But it's right there!" Katalon: "Technically... the text on the screen is 'rev vibe' with lowercase letters. I don't do lowercase. I have standards." Me: Writes 5 lines of XPath with translate function Katalon: "Acceptable. Found 1 element." Me: "Now check if the toggle is ON." Katalon: "Checking... It has no attribute aria-checked." Me: "But it's yellow! It's clearly on!" Katalon: "I don't see colors, Vadim. I only see HTML. And this HTML is empty inside. Just like my soul." The Result: Me: "Did the test pass?" Katalon: "Yes." Me: "Why is the log yellow?" Katalon: "Because you used FailureHandling.OPTIONAL. I did what you asked, but I want you to know I didn't like it."