When developers use webContents‘s will-prevent-unload event,
They want to ask the user to confirm something most of the time.
Like this:

win.webContents.on('will-prevent-unload', event => {
    let choice = dialog.showMessageBoxSync({
      title:'do you want to close',
      buttons:['cancel','yes']
    });
    if(choice === 1)  event.preventDefault();
    //...
  })
`

Description

When no duration is specified with the --animation-duration then the animation does not perform.
If I inspect my element I can see:
animation-duration: var(--animate-duration);
I think you should be using fallback values so that is the user doesn't specify a duration then it will default:
`

any plans for a Linux ARM build? if nobody else is on it or has attempted it, i can give it a try.

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.2.2
• Cross-platform modules: 6.0.1
• Android Runtime: 6.2.0
• iOS Runtime: 6.2.0
• Plugin(s): unrelated

Describe the bug
openFile method of utils module does not preview the

This came up for fixes to svg-gradient() (less/less.js#3261). There are no automated visual regression tests, so it might be good to do so for functions that create visual assets. See: https://github.com/garris/BackstopJS

Describe the bug
When using row-span attribute border is missing!

To Reproduce

1. Create a table
2. Use row-span attribute

Expected behavior
Border show normally

Screenshots

Environment:

• OS: MacOS