Pipeline E2E Test

Source HTML (3 iframes, 1 bg video, 5 imgs, 2 anchors)

1. Background video (autoplay+loop+muted - keep untouched)

2. YouTube iframes (5 total - 3 budget + 2 lite-embed)

3. Images (no loading attribute - will get added)

Image 1 Image 2 Image 3 Image 4 Image 5

4. External anchors (target=_blank, no rel - will get rel=noopener)

External link 1 External link 2

5. YouTube BG iframe (autoplay=1 in src - keep untouched)