<meta name="twitter:app:name:googleplay" content="twitter_app" />
viewport
Good to know: The viewport meta tag is automatically set with the following default values. Usually, manual configuration is unnecessary as the default is sufficient. However, the information is provided for completeness.
layout.js / page.js export const metadata = {
  viewport: {
    width: 'device-width',
    initialScale: 1,
    maximumScale: 1,
  },
}
<head> output <meta
  name="viewport"
  content="width=device-width, initial-scale=1, maximum-scale=1"
/>
verification
layout.js / page.js export const metadata = {
  verification: {
    google: 'google',
    yandex: 'yandex',
    yahoo: 'yahoo',
    other: {
      me: ['my-email', 'my-link'],
    },
  },