URL: https://h5.m.taobao.com/mlapp/olist.html?spm=a2141.8294643.drawer.orders

Browser / Version: Firefox Mobile Nightly 57.0a1 (2017-09-18)
Operating System: Samsung Galaxy S6 (Android 7.0) - 1440 x 2560 pixels (~577 ppi pixel density)
Tested Another Browser: Yes

Problem type: Design is broken
Description: The text layout breaks after deleting the username
Steps to Reproduce:

1. Navigate to: https://h5.m.taobao.com/mlapp/olist.html?spm=a2141.8294643.drawer.orders
2. Tap the 新用户注册 button.
3. Type anything in the username text field.
4. Delete the typed text by pressing the Backspace button on the keyboard.

Expected Behavior:
The layout doesn't change.

Actual Behavior:
The red text overlaps the black text.

Notes:

1. The issue is also reproducible on Firefox 55.0 Release (Mobile).
2. The issue is not reproducible on Chrome (Mobile) 60.0.3112.116.

Watchers:
@softvision-oana-arbuzov
@softvision-sergiulogigan

sv; country: tw

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