(In reply to Daniel Holbert [:dholbert] from comment #6) > [...] if you do several mousewheel-spins while also subtly moving the mouse (just from placing your hand on it), it's quite easy/possible for the **first spin** to inadvertently change the value that you just entered [...] and then for the **subsequent mousewheel-spins** to successfully scroll the page. This can mean you change the number you just entered without noticing. Here's a screencast to demonstrate this, with testcase 2.
Bug 1741469 Comment 8 Edit History
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(In reply to Daniel Holbert [:dholbert] from comment #6) > [...] if you do several mousewheel-spins while also subtly moving the mouse (just from placing your hand on it), it's quite easy/possible for the **first spin** to inadvertently change the value that you just entered [...] and then for the **subsequent mousewheel-spins** to successfully scroll the page. This can mean you change the number you just entered without noticing. Here's a screencast to demonstrate this, with testcase 2. At 0:05, I start some repeated-scrolls of my scrollwheel, while inadvertently moving the mouse. Within ~1 second, the page is indeed scrolling, so it's easy to miss the fact that the very start of the scroll operation *also* modified the value that I entered.