New web component: <webcare-webshare>

Uses the Web Share API to share a web site, falling back (on desktop usually) to a copy to clipboard workflow.

📮 Blog post: www.zachleat.com/web/webcare-...
🖼️ Demo: zachleat.github.io/webcare-webs...
⚙️ Source code: github.com/zachleat/web...