tab focus inside form at IE11

[crazyx13th]

• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

https://ant.design/components/form/

Steps to reproduce

At first two examples (Horizontal Login Form, Login Form) you can't jump from username to password with one Tab-Keypress at IE11

What is expected?

normal Tab-Key behavior like at chrome

What is actually happening?

you can't jump from username to password with one Tab-Keypress, you need to press Tab two times at IE11

Environment	Info
antd	3.16.2
React	16.8.6
System	Win 10
Browser	IE11

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I think the "label-icon" is focused on IE11

thx!

greetings
crazyx13th

[GuentherK]

What causes this problem are the SVG's that are displayed. Add focusable="false" to the SVG tag and it will work

[crazyx13th]

thx GuentherK for details and zombieJ for fix this tiny bug!