I work in raw PHP, plain CSS, and stubborn shell scripts. And coffee.
Scroll, this is real footage
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FIG. 01 · FRAME BUFFER
Every still, decoded up front
87 frames held in memory before the first scroll. Nothing streams, so seeking costs nothing.
FIG. 02 · SCROLL MAP
Your thumb is the transport
Page position maps straight to a frame index. There is no play button anywhere on this page.
FIG. 03 · REVERSAL
To the end, then home
Halfway through, the map flips. The film runs to its last frame and plays itself backwards to the start.
FIG. 04 · THE GRADE
Two gradients, one job
Paper falls over the top of the canvas, ink pools under the type, so the chips and headline always clear the footage.