Test page features

This page has two iframes: one is cross-site, the other is same-site. This helps test save-page when page spans multiple renderer processes. This page has iframes - this exercises a different link-to-local-path replacement code than the one used for non-frames / for savable-resources. This page references /save_page/1.png resource from both 1) the main frame and 2) the /save_page/b.htm same-site subframe (same-site means that #1 and #2 refer to 1.png via the same url). This helps test that savable resources are deduplicated across frames.

Test content

Content verification marker: frames-xsite.htm: 896fd88d-a77a-4f46-afd8-24db7d5af9c2