The frames and workers holding the most memory, largest first, capped at 20. Memory shared
between several contexts or not attributed to any is left out, so the list can sum to less
than total.
Megabytes by memory type, such as JavaScript, DOM, or Shared. Memory the browser
attributes to several types is keyed by the types joined with +, and untyped memory by
Other.
Unix timestamp in milliseconds when the measurement resolved.
Total memory in megabytes used by the page, its same-origin iframes, and its workers.
Memory attributed to the page by
performance.measureUserAgentSpecificMemory(), available in Chromium only when the page is cross-origin isolated.