Position new popup window on screen

create-window.ts

// Position by ratio
const xPos = 0.75  // 3/4 to the right
const yPos = 0.5  // Centered vertically

// Size of window
const width = 480
const height = 305

// Create window
await chromep.windows.create({
  type: 'popup',
  url: 'https://google.com',
  width,
  height,
  top: Math.floor((screen.height - height) * yPos),
  left: Math.floor((screen.width - width) * xPos),
})

Of course, the size of the window matters. Too big, and the position will look weird.