How to collect bounding boxes of interactable regions of the webpage from the DOM tree ?

[pange1802703882]

Thank you for the excellent work ！！！ In the paper, I find some describtion " Specifically, we curate a dataset of interactable icon detection dataset, containing 67k unique screenshot images, each labeled with bounding boxes of interactable icons derived from DOM tree. We first took a 100k uniform sample of popular publicly availabe urls on the web [OXL+22], and collect bounding boxes of interactable regions of the webpage from the DOM tree of each urls. Some examples of the webpage and the interactable regions are shown in 2. " 。
I want to know how to obtain relevant location information for bbox with clickable elements in Dom Tree ?