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Chapter 1 · Fast is not a number
Chapters
Keyboard
- Space Play or pause
- ← → Back or ahead 5 seconds
- [ ] Previous or next chapter
- C Captions · M Mute · F Full screen
Transcript
Notes for class
- Pairs with the Availability lesson (rungs 1–2: is it there, did it arrive in time).
- RAIL numbers are from web.dev, Measure performance with the RAIL model (CC BY 4.0, last updated June 2020). Core Web Vitals thresholds are from Web Vitals (updated October 2024).
- Try the arithmetic yourself with the Who is visiting? estimator: pick a visitor, set a page weight, and read the seconds.
- The narration is a synthetic voice (ElevenLabs). Timing follows the narration track, so a recorded voice-over can replace it cue for cue using the transcript.
- With Reduce Motion turned on in the operating system, the film keeps its fades and drops the sliding motion.
- Set in Atkinson Hyperlegible Next and Mono, typefaces the Braille Institute designed for readers with low vision.
Take it with you
- Video (MP4, 1080p, 6:15, 10 MB), with English captions built in
- Captions: WebVTT or SRT, for Canvas or YouTube
- Narration script (plain text) with chapter timecodes, for recording your own voice-over