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Based on the provided text, it appears to be a piece of code related to web performance optimization and browser compatibility. The website seems to be focused on enhancing the functioning and efficiency of websites through various techniques like using performance measurement tools (e.g., PerformanceTiming API) and polyfills for unsupported features in different browsers. It mentions functions like "noop" (no-operation), "datenow" (current timestamp), and "performancenow" for measuring timing between events or actions. Additionally, it may involve image loading/error handling, returning primitive values, manipulating promises, and enabling cross-origin resource sharing. However, without further context or additional parts from the website content itself, it is difficult to determine the specific purpose or theme of the website.