This site against Stripe, Linear, Column and Increase

The hero background is a full-viewport WebGL shader. It now reads WEBGL_debug_renderer_info and falls back to the static gradient on SwiftShader, llvmpipe and Microsoft Basic Render. Software rasterisation costs 65 ms a frame on the CPU, so a GPU-less machine got 15fps and a pegged core. Six of the desktop run’s seven long tasks were this one file.

The 50 scripts sit before </body> and carry no defer, deliberately. defer pushed their execution past First Contentful Paint, which is where blocking time is counted. A/B on production: with defer, 300 ms and 83; without, 100 ms and 90. It cost 0.3 s of FCP. TBT weighs 30 in the score, FCP weighs 10.

Tab panels are on <section>, not <article>: ARIA in HTML allows an article six roles and tabpanel is not one. Touch targets reach 24 px through a pseudo-element, not a transform, which grows a button past its own box and overlaps its neighbour. Inactive slides are inert, not aria-hidden, so they leave the tab order instead of staying focusable while unannounced.

The halftone engine samples Rec.601 luminance and nothing else, so every colour channel in its source images was decoded and thrown away. Re-encoded as 8-bit greyscale, reproducing the engine’s own alpha-threshold rule, verified byte-identical on the luminance it reads. 111 files, 7.87 → 2.81 MB. Vendor logos draw at 16–20 px; one was a 204 KB multi-resolution .ico.

Fonts came from two external origins whose stylesheets pointed at a third, so first paint waited on a four-hop chain: 258 ms to the CSS, 813 ms to the last font. All seven faces are self-hosted and subset. Newsreader is used by one rule at italic 500 and was shipping as a variable font with weight and optical-size axes.

Titles, descriptions, canonicals, Open Graph cards and JSON-LD are generated from the filesystem, not written by hand, so they cannot drift from the pages they describe. Six deterministic gates run before every deploy and fail it on a regression.