I was reading Stefan Judis's awesome "Web Weekly" and in this weeks post he mentioned the EyeDropper API in Chromium Desktop browsers only - I totally missed this and because I frequently have to grab color information for slide design I need something quick to hand. Bookmarklets are quick to hand, so I built one for you.
const e = new EyeDropper();
e.open().then(d => {
alert(d.sRGBHex);
}).catch(console.error)
EyeDropper <— Just drag this to your bookmark bar.
And if you are interested in a Chrome Extension, check out this post by Patrick Brosset.