Active state of disabled button is triggering when <i> or <b> inside a button is clicked.

Created by: max41479

• Operating system: Windows 7 SP1.
• Browser: Chrome v 60.0.3112.90, (64 bit)
• https://jsbin.com/vewexuviqi/1/edit?html,css,js,output - first 2 buttons is bugged, last one isn't.

<i>123</i>, <b>123</b> tags inside of <button type="button" class="btn btn-lg btn-outline-dark" disabled></button> tag causes triggering active state of button when button is clicked. (<a>123</a> and maybe other tags causes this behavior too). In Firefox 54.0.1 (32-bit), Microsoft Edge 38.14393.1066.0 and IE 11.0.9600.18762 all disabled buttons is triggering active state regardless of <i> or <b> tags.