Poster before intent, working video afterwards

How to audit deferred video loading

Record Network before scroll and click, then press Play once. A good facade makes no early provider requests, preserves layout and becomes an accessible working player.

Comparing network requests before and after pressing Play on a video facade — Evidence includes both states of the same page.

Browser check

Open the page in a clean window, DevTools → Network, enable Disable cache and Preserve log.
Reload without scrolling. Filter the video provider's domain, Media, JS and iframe.
For click-to-load, expect zero player/video-provider requests before action. A local poster may load.
Scroll to the block without clicking and record whether a near-viewport strategy loads its iframe as intended.
Press Play once: requests should begin, layout should remain stable, and playback should start or show a clear ready state.
Repeat with keyboard, mobile and throttled network; inspect Console, focus, captions, consent and analytics events.

Issue levels

How to rate lazy video
Observation	Level	Action
Only poster before click; first click starts stable player	No issue	Save HAR and test recording
Offscreen iframe loads near viewport	Acceptable	Compare with click-to-load requirement
Player and third-party JS load immediately without need	High	Add facade or preload none
First click lost, focus/controls absent or consent broken	Critical	Roll back and repair interaction

Technical inventory

[...document.querySelectorAll('video, iframe')].map(el => ({
  tag: el.tagName,
  src: el.currentSrc || el.src,
  loading: el.loading,
  preload: el.preload,
  size: [el.clientWidth, el.clientHeight],
  title: el.title
}))

This lists rendered video/iframe elements, but a pre-click facade may intentionally contain neither. Combine DOM inventory with Network evidence and button testing.

False conclusions and scope

loading="lazy" on an iframe means near-viewport loading, not necessarily waiting for click.
preload="none" is a browser hint; assess poster and support requests separately.
Service worker, cache and an already-open player can hide requests; use a clean profile.
Consent may correctly block a provider beforehand; test both states.
No initial requests does not prove accessibility, captions or successful playback.

Automated pricing applies to agreed templates and players on the service page. Use the step-by-step guide for repairs.

How to Audit Deferred Video Loading