BUG: Css attribute (-webkit-background-clip:text;) doesn't work in grapesjs-preset-webpage.

Version: "grapesjs": "^0.17.3" "grapesjs-preset-webpage": "^0.1.11"

You can get the version by typing grapesjs.version into the console

Are you able to reproduce the bug from the demo?

• Yes
• No

What is the current behavior? Css attribute (-webkit-background-clip:text;) doesn't work in grapesjs-preset-webpage(disappear when import). But it works in Grapesjs offical demo. https://grapesjs.com/demo.html Is GrapesJs official demo source different to plugin grapesjs-preset-webpage?

Describe the bug detailed I'm trying to import the css attribute (-webkit-background-clip:text;) to grapesjs-preset-webpage, but it didn't work well(it disappears when import). Then, I try to import to same code at GrapesJs official demo, and it's work. I have no idea what's going on. Please Help!

Are you able to attach screenshots, screencasts or a live demo?

• Yes (attach)
• No

From grapesjs official demo https://grapesjs.com/demo.html It's work when import css attribute (-webkit-background-clip:text;)

From downloaded grapesjs-preset-webpage demo (-webkit-background-clip:text;) disappeared when I import css attribute (-webkit-background-clip:text;)

![InkedCapture1_LI1](https://user-images.githubusercontent.com/38772689/119304401-c705db00-bc99-11eb-9693-87ebee0bad39.jpg)

Both Import the same code:
![Capture3](https://user-images.githubusercontent.com/38772689/119305033-b7d35d00-bc9a-11eb-95fd-b6504398fcb6.PNG)

code below:
<pre>
&lt;h1 class="h1"&gt;
   asdsd
&lt;/h1&gt;

<style>* {
  box-sizing: border-box;
  }
  body {
    margin: 0;
  }
  *{
    box-sizing:border-box;
  }
  body{
    margin:0;
    background:black;
  }
  .h1{
    background:linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0));
    -webkit-text-fill-color:transparent;
    -webkit-background-clip:text;
  }
  </style>
  </pre>