I have verified that the "Learn more" and "File Format Issue" texts from the "Import Error" modal and the "View detailed Import Summary" text from the "Import Complete" modal have been changed to weight 600 (observed using the Inspector tool). Tested on Firefox Nightly 90.0a1 (Build ID: 20210422093115) using Windows 10, Linux Mint 20 and macOS 11.1. Visually, on Windows 10, the implementation seems almost if not perfectly true to the documentation; on Linux Mint 20, the change from bold to demi-bold doesn't seem noticeable on my system; on macOS 11.1 the font seems slightly bolder than on the other 2 platforms (which was always the case), but the change is observable.
Bug 1706047 Comment 9 Edit History
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I have verified that the "Learn more" and "File Format Issue" texts from the "Import Error" modal and the "View detailed Import Summary" text from the "Import Complete" modal have been changed to weight 600 (observed using the Inspector tool). Tested on Firefox Nightly 90.0a1 (Build ID: 20210422093115) using Windows 10, Linux Mint 20 and macOS 11.1. Visually, on Windows 10, the implementation seems almost if not perfectly true to the documentation; on Linux Mint 20, the change from bold to demi-bold doesn't seem noticeable on my system; on macOS 11.1 the font seems slightly bolder than on the other 2 platforms (which was always the case), but the change is observable (the current state being similar to the one observed on Linux Mint).