Tests that user agent styles are shown based on the setting: https://bugs.webkit.org/show_bug.cgi?id=37766. I'm red. I'm also red. Running: testShowUserAgentStyles WebInspector.settings.showUserAgentStyles = true [expanded] element.style { () [expanded] h1 { (show-user-agent-styles.html:5 -> show-user-agent-styles.html:5:1) background-color: red; [expanded] h1 { (user agent stylesheet) display: block; font-size: 2em; -webkit-margin-before: 0.67em; -webkit-margin-after: 0.67em; -webkit-margin-start: 0px; -webkit-margin-end: 0px; font-weight: bold; Running: testShowUserAgentStyles WebInspector.settings.showUserAgentStyles = false [expanded] element.style { () [expanded] h1 { (show-user-agent-styles.html:5 -> show-user-agent-styles.html:5:1) background-color: red;