Frames cut across many parts of the browser.
During box-tree construction (box_construct.c), frameset, frame, and iframe elements are converted into structures in the 'struct content' for the HTML document.
Framesets and frames form a tree of 'struct content_html_frames' at content->data.html.frameset. For example, the source
<frameset rows="50%,50%">
<frameset cols="40,200">
<frame name="A" src="aaa">
<frame name="B" src="bbb">
</frameset>
<frameset cols="3*,*">
<frame name="C" src="ccc">
<frame name="D" src="ddd">
</frameset>
</frameset>
results in the tree
0x6099f2f4 (2 1) w0px h0px (margin w0 h0) (scrolling no)
(0 0): 0x608b730c (1 2) w100% h50% (margin w0 h0) (scrolling no)
(0 0): 0x608dae74 (0 0) w40px h100% (margin w0 h0) 'A' <aaa> (scrolling auto) border 0
(0 1): 0x608daeb0 (0 0) w200px h100% (margin w0 h0) 'B' <bbb> (scrolling auto) border 0
(1 0): 0x608b7348 (1 2) w100% h50% (margin w0 h0) (scrolling no)
(0 0): 0x608d9b4c (0 0) w3* h100% (margin w0 h0) 'C' <ccc> (scrolling auto) border 0
(0 1): 0x608d9b88 (0 0) w1* h100% (margin w0 h0) 'D' <ddd> (scrolling auto) border 0
(output from html_dump_frameset()).
When a document containing frames is displayed in a browser window, child windows are created for frames and iframes. This occurs when a browser window receives a CONTENT_MSG_READY in browser_window_callback(), which calls browser_window_create_frameset().
browser_window_create_frameset() constructs a tree of 'struct browser_window' corresponding to the tree of 'struct content_html_frames'. For each new browser_window, it calls gui_create_browser_window() to create and open the actual platform-specific window (represented by a 'struct gui_window').
When this is completed it calls browser_window_recalculate_frameset() which calculates the positions of each frame in pixels and calls gui_window_position_frame() to position each one.
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