Resource Initiator Reporting

The proposed project aims to enhance the Resource Timing API by incorporating initiator information to identify the resource that triggered the fetch of other resources. The implementation of this feature involves introducing two new attributes to the existing API. The proposed logic has been designed to ensure optimal behavior and appropriate specification changes will be implemented before shipping it to the stable channel via blink shipping process. Additionally, revisions to the MDN documentation will reflect the updated status and functionality of the enhanced API.