Can not work with gridstack.js

[bigfacewo]

Bug reports:

When i use the gridstack.js, the html2canvas can not work, when i remove gridstack,it's work fine! I don't know how to fix it. Please give me some advice,Thanks.

This is my screenshot with html:

This is my screenshot with html2canvas:

Specifications:

• html2canvas version tested with: 1.0.0-alpha.4
• Browser & version: Chrome( 62.0.3202.94)、Firefox(57.0.2)
• Operating system: Win10(15063.726)

[bigfacewo]

this is not gridstack's wrong.