Comet, a new autonomous browser from Perplexity, excels at quickly performing web tasks by relying on the accessibility tree and raw DOM for interacting with web elements, but it faces limitations due to the inherent messiness and diversity of the web. While Comet is effective on well-structured sites that adhere to best practices, it struggles with complex applications that do not follow standard web development rules, particularly when dealing with cross-origin iframes or elements lacking proper labels. Comet's reliance on HTML structures and accessibility features, without utilizing screenshots, presents challenges when interacting with images or icons that aren't properly labeled. In contrast, the Harness AI Test Automation employs a bimodal approach, combining screenshots with DOM and accessibility data to provide broader coverage and more reliable interactions, especially in enterprise applications with older or inconsistent accessibility implementations. Ultimately, Comet is well-suited for environments where its assumptions are met, but a bimodal approach could enhance its effectiveness across the diverse landscape of the web.