Move/Resize-icons are not shown for most HTML tag elements

[timeraider4u]

First, thank you for developing this great library. Unfortunately, I have found something weird which looks like a bug to me:

The move/resize icons are only shown for DIV, LABEL or IMG tags but not for BUTTONs/INPUT elements. The drag&drop and resize actions are working for all elements anyway.

Steps to reproduce

Reproducibility: Always

Take any example from http://interactjs.io/ e.g., the resizing example.
In the HTML body replace

<div class="resize-container">
  <div class="resize-drag">
     Resize from any edge or corner
  </div>
</div>

with

<div class="resize-container">
  <button class="resize-drag">
     Resize from any edge or corner
  </button>
</div>

Expected behavior

Actual behavior

System configuration

interact.js version: 1.3.3
Browser name and version: Google Chrome 64.0.3282.186, MS IE 11, Mozilla Firefox 58.0.2
Operating System: MS Windows 7 (64-bit)

[eldadts]

Same problem v1.3.4