• A web API that allows to indicate the relative importance of resource requests to help browsers optimize loading performance by prioritizing critical resources. Using the fetchpriority attribute on HTML elements (like <img>, <link>, or <script>) or the priority option in the Fetch API, developers can specify values of high, low, and auto to influence how browsers schedule network requests. This enables more granular control over resource loading order, helping ensure that above-the-fold content, critical images, or essential scripts load before less important resources.

1. Related terms: Fetch API · Priority queue · Adaptive loading · Priority of Constituencies
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