Observation data · 2026-11-06

The internal quote, recorded

This is a recorded local JavaScript specimen in horizontal, untransformed Latin layout in Chromium, not a benchmark of browser support, reading outcomes, or downloaded releases. The engine version was not logged in the original panel session. The 54% example is an additional targeted state, outside the eight core states below.

Recorded Chromium specimen at 54% width: the sixth line’s opening quote protrudes left of the vertical start guide.

Magnified recorded detail · sixth-line quote left of guide

Magnified recorded lines five through seven. Beneath the line ending ‘internal line’, the sixth line’s opening quote protrudes left of the guide.

Static Chromium observation, November 6, 2026. Horizontal Latin layout without transforms; Justified, Start/End on, 1440 × 1100 viewport. Quote x=199.5; guide x=208; displacement 8.5 CSS px in the recorded layout. Detail is magnified; displayed separation scales with the image. Pixel crops only; no redrawn type or untreated comparison. Method and provenance.

Reproduce the line

1440 × 1100 CSS-pixel viewport. Column 54%, Justified, Start/End on, threshold 0.5px, maximum ratio 0.90. Wait for fonts, then locate the sixth rendered line. The preceding line ends with “internal line.”

Observed quote start 199.5px; paragraph start 208px; difference 208 − 199.5 = 8.5px. These are advance coordinates in the recorded original layout, not ink bounds or pixels in a resized presentation.

Eight core states

State	Width	Alignment	Start treatment	End treatment
default	100%	justify	Observed	Observed
compare	100%	justify	Observed	Observed
narrow	50%	justify	Observed	Observed
left	50%	left	Observed	None
left-start-off	50%	left	None	None
right	50%	right	None	Observed
right-end-off	50%	right	None	None
zero-ratio	50%	justify	None	None

Reconciliation: 8 operated states = 3 both edges + 1 start only + 1 end only + 3 neither. Screened out: 0. Unclassified: 0. These are interface states, not independent samples or success rates.

What is not measured

Canvas fallback is an approximation, not equivalent to every shaped DOM setting. Vertical writing and transformed geometry are not validated. Native-supporting-engine comparison: NOT MEASURED. Other-engine JavaScript renders, unsupported-browser fallback, screen readers, reading outcomes, wrapper and release parity: NOT TESTED in this observation set. The paper separates CSS specification and discussion from Chromium observation.

Figure provenance

Existing observed screenshot, pixel crop only: x=185, y=706 through x=785, y=1025. The additional detail is cropped at (190,842)–(785,928) from the same original and explicitly magnified. No letters or guides were redrawn. These are static images, not a live demonstration. Original screenshot SHA-256:

3053176ae3cb150a71f3e8544c46226cc2f8772991ee91b686658cc15d6354e3

Original evidence: panel/round1/sceptic/internal-opening-54.png. A later Start-off check removed the treatment wrapper; it did not record an off-state character coordinate.

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