DOM Content Loaded (Start/End)
Collected from: Web Browser (API)
jQuery.ready is doing). The DOMContentLoaded event fires when the initial HTML document has been completely loaded and parsed (without waiting for images, and iframes to finish loading).
If DOMContentLoaded End is significantly higher than DOMContentLoaded Start, it means the page has listeners attached to this event triggering significant code execution and/or relying on network.
DOMContentLoaded Start immediately follows DOM Interactive. Between DOMInteractive and DCL Start, the only treatments are related to async scripts with a module type.