What's the difference between `DOMContentLoaded` and `window.onload` in relation to this error?

`DOMContentLoaded` fires when the initial HTML document has been completely parsed and all elements in the document have been built, without waiting for stylesheets, images, and subframes to finish loading. `window.onload` fires when the entire page has finished loading, including all dependent resources like images and stylesheets. For this error, `DOMContentLoaded` is generally preferred as it's faster and renders the graph sooner.