Bugzilla

Here's a screencast demonstrating scenario (2) from comment 10.

(I was a bit anxious about screencasting Slack in a way that avoids leaking my/others' PII, but I think I managed to do so here; there's just a list of some folks I've DM'd which I'm not concerned about.)

In this screencast:
- I'm using the window-size that mozregression gives me by default.
- I'm not touching `security.sandbox.content.level` (so I don't have any warning info-bar)
- I start out with DevTools open, in separate window; this demonstrate that DevTools itself is not causing the problem, and it lets me demonstrate the initial "good" viewport size when I hover the `html` element (see the overlay at the top of the screen)
- Then I attach DevTools to the bottom of my browser, and that impacts the viewport height (as shown via the overlay again), arriving at `853.333px x 467.2px`, and the bug immediately starts reproducing.

Here's a screencast demonstrating scenario (2) from comment 10.

(I was a bit anxious about screencasting Slack in a way that avoids leaking my/others' PII, but I think I managed to do so here; there's just a list of some folks I've DM'd which I'm not concerned about.)

In this screencast:
- I'm using the window-size that mozregression gives me by default.
- I'm not touching `security.sandbox.content.level` (so I don't have any warning info-bar)
- For the first half of the video, the bug is **not reproducing**.
- I start out with DevTools open, in separate window. this demonstrate that DevTools itself is not causing the problem, and it lets me demonstrate the initial "good" viewport size when I hover the `html` element (see the overlay at the top of the screen)
- Then I attach DevTools to the bottom of my browser, and that impacts the viewport height (as shown via the overlay again), arriving at `853.333px x 467.2px`, and the bug immediately **starts reproducing**.

Here's a screencast demonstrating scenario (2) from comment 10.

(I was a bit anxious about screencasting Slack in a way that avoids leaking my/others' PII, but I think I managed to do so here; there's just a list of some folks I've DM'd which I'm not concerned about.)

In this screencast:
- I'm using the window-size that mozregression gives me by default.
- I'm not touching `security.sandbox.content.level` (so I don't have any warning info-bar)
- For the first half of the video, the bug is **not reproducing**.
- I start out with DevTools open, in separate window. This demonstrate that DevTools itself is not causing the problem, and it lets me demonstrate the initial "good" viewport size when I hover the `html` element (see the overlay at the top of the screen)
- Then I attach DevTools to the bottom of my browser, and that impacts the viewport height (as shown via the overlay again), arriving at `853.333px x 467.2px`, and the bug immediately **starts reproducing**.

Here's a screencast demonstrating scenario (2) from comment 10.

(I was a bit anxious about screencasting Slack in a way that avoids leaking my/others' PII, but I think I managed to do so here; there's just a list of some folks I've DM'd which I'm not concerned about.)

In this screencast:
- I'm using the window-size that mozregression gives me by default.
- I'm not touching `security.sandbox.content.level` (so I don't have any warning info-bar)
- For the first half of the video, the bug is **not reproducing**.
- I start out with DevTools open, in separate window. This demonstrate that DevTools itself is not causing the problem, and it lets me demonstrate the initial "good" viewport size when I hover the `html` element (`853.333px x 634.133px`, shown in the overlay at the top of the screen at e.g. t=9s)
- Then I attach DevTools to the bottom of my browser, and that impacts the viewport height (as shown via the overlay again at e.g. t=16s, `853.333px x 467.2px`). The bug immediately **starts reproducing** (visible at e.g. t=14s and afterward).