CSS errors on welcome page (mask-* properties)

[dipnlik]

• GitLens Version: 8.0.0
• VSCode Version: 1.20.0
• OS Version: Ubuntu 17.10

Steps to Reproduce:

1. Ctrl-Shift-P, GitLens: Welcome.
2. Look at these 5 Problems in the status bar.

---

file: 'file:///home/dipnlik/.vscode/extensions/eamodio.gitlens-8.0.0/welcome.html'
severity: 'Warning'
message: 'Unknown property: 'mask-image''
at: '1,3972'
source: 'css'
code: 'unknownProperties'

file: 'file:///home/dipnlik/.vscode/extensions/eamodio.gitlens-8.0.0/welcome.html'
severity: 'Warning'
message: 'Unknown property: 'mask-repeat''
at: '1,4626'
source: 'css'
code: 'unknownProperties'

file: 'file:///home/dipnlik/.vscode/extensions/eamodio.gitlens-8.0.0/welcome.html'
severity: 'Warning'
message: 'Unknown property: 'mask-image''
at: '1,6598'
source: 'css'
code: 'unknownProperties'

file: 'file:///home/dipnlik/.vscode/extensions/eamodio.gitlens-8.0.0/welcome.html'
severity: 'Warning'
message: 'Unknown property: 'mask-size''
at: '1,7026'
source: 'css'
code: 'unknownProperties'

file: 'file:///home/dipnlik/.vscode/extensions/eamodio.gitlens-8.0.0/welcome.html'
severity: 'Warning'
message: 'Unknown property: 'mask-repeat''
at: '1,7074'
source: 'css'
code: 'unknownProperties'

---

I don't know what's the expected behavior of these CSS properties in the page but the page doesn't look "broken" and having problems pop up in the status bar looks bad, so maybe these properties can be safely removed?

[eamodio]

I can remove those unprefixed versions for now (they were added as future-proofing) as this is not noise I want to expose users to, but I also opened microsoft/vscode#43678

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.