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Based on the provided text, it is difficult to determine the exact topic or purpose of the website. The text seems to be a collection of JavaScript code snippets related to performance measurement and window viewer models. It also mentions some functions related to error handling and image sources. Therefore, based solely on this information, we can infer that the website might be about web development or programming-related topics, specifically discussing performance optimization and error handling in JavaScript. However, without further context or examination of other parts of the website's content, this summary may not accurately reflect the entire site's subject matter.