Paste this into your browser's JS console to view all @media query and @element query breakpoints used on the site

detecting-breakpoints.js

// List all media query breakpoints
import('https://unpkg.com/cssomtools').then(({process, query}) => {
  const found = new Set

  process(
    query(),
    rule => {
      if (
        rule.media
        && rule.media.mediaText
      ) {
        found.add(rule.media.mediaText)
      }
    }
  )

  console.group('Media Query Breakpoints')
  console.log(found)
  console.groupEnd()
});

// List all EQCSS breakpoints
(() => {
  const found = new Set

  if (
    'EQCSS' in window
    && EQCSS.data
    && EQCSS.data.length
  ) {
    EQCSS.data.forEach(query => {
      const conditionText = query.conditions.map(({measure, value, unit}) => 
        `and (${measure || ''}: ${value || ''}${unit || ''})`
      ).join(' ')

      if (conditionText.length) {
        found.add(conditionText)
      }
    })
  }

  console.group('EQCSS breakpoints')
  console.log(found)
  console.groupEnd()
})();