v148 · HTML · Performance
Bandwidth Savings Lab
A simulated news feed with 12 video and audio elements. Toggle loading="lazy" globally, adjust the network throttle, and watch the bandwidth budget drop. Each element shows its load state and estimated bytes.
Controls
Network budget
Data transferred
0 MB
of 60 MB total
Savings calculator (lazy vs eager)
0 MB
bandwidth saved
0 g CO₂
CO₂ equivalent saved
0 s
time saved on 3G
Simulated news feed (12 media elements)
Element-by-element load table
| # | Type | State | Est. size | Bytes loaded | Viewport dist. | Priority |
|---|
see also
implementation reference
Need the exact API surface, compatibility boundaries, errors, lifecycle, and source links? Read the matching gendn reference ↗