Why browser engines ≠ real desktop browsers ≠ mobile browsers

All of us have tested on either headless browsers, browser engines or responsive mode for mobile. However, there are a lot of differences between an actual browser, desktop and mobile, vs a simulated one. In this talk David will walk you through real world examples that show you the gaps you can miss while testing:

• In headless mode
• Browser engines
• Responsive mode for mobile browsers

He’ll also share the technicalities of why this happens and his learnings from being a part of the Mozilla team.