OPEN INSTRUMENTS

SEMANTIC HTML · ARCHIVED RESULTS

Semantic HTML.
Compare what tools preserve.

The same text. One markup change.
Two outputs to inspect, with evidence.

Explore an archived run from 20 September 2026, re-evaluated on 21 September. No extraction runs during your visit.

EXPLORE THE CONTROLLED CORPUS

Heading

Mozilla Readability 0.6.0 · Extractor / reading tool · English document

All 42 comparisons

The check distinguishes heading text, markup and level. It does not evaluate whether content belongs to a section. Test scope.

A

VARIANT A

An h2 heading

Output produced

Heading text : Present. Source

01 · The HTML change

<h2 class="case-marker">Measurement conditions</h2>

Exact input excerpt · Original HTML ↓

02 · What the tool produces HTML

…
<h2>Measurement conditions</h2><p>Sensor A operated for 30 minutes. The measurement was repeated in the same environment, without remote resources or executed scripts.</p><p>The conclusion must be read with its unit, period, scope and caveat. Finding a word in an output is not enough to prove that the relationship was preserved.</p></article></div></div>

Excerpt identified by the corrected evaluator. Full output below.

03 · The documented observation

Heading text
Present
Heading markup
Explicit relationship
Heading level
h2
Section membership
Not evaluated

Verdict source: results.json · heading-en-1 / readability

Inspect the full evidence

The verdicts above come from corrected results.json. The raw file’s evaluation fields are historical and are not authoritative here.

results.json/cases/6/evaluation/relation/readability

Corrected verdict, unchanged
{
  "status": "ok",
  "tool_class": "content_extractor",
  "format": "html",
  "heading_relation": "explicit",
  "heading_level": "h2",
  "evidence": {
    "excerpt": "<h2>Measurement conditions</h2>"
  },
  "output_field": "readability.content",
  "output_sha256": "f975f2b307c50cac67dd869eeadd093c9bc67ede9b27ea6ec3f81003ce7638d7"
}
Complete studied output field

readability.content

<div id="readability-page-1" class="page"><div><article><p>This synthetic document compares two markups while text, order, classes and surroundings remain identical. The data are fictional and describe neither Edikka nor a client.</p><h2>Measurement conditions</h2><p>Sensor A operated for 30 minutes. The measurement was repeated in the same environment, without remote resources or executed scripts.</p><p>The conclusion must be read with its unit, period, scope and caveat. Finding a word in an output is not enough to prove that the relationship was preserved.</p></article></div></div>
Archived version and options

Mozilla Readability 0.6.0 · Execution 2026-09-20

{
  "version": "0.6.0",
  "configuration": {
    "keepClasses": false,
    "charThreshold": 500,
    "disableJSONLD": false
  }
}

Archived runner · Python options

SHA-256 hashes
HTML input
e4c8dd8b2ea87f113776cfe6a51420c484a24c97750639347c1ddec38b1445c1
Evaluated output field
f975f2b307c50cac67dd869eeadd093c9bc67ede9b27ea6ec3f81003ce7638d7

Complete raw output file ↗

B

VARIANT B

A div block

Output produced

Heading text : Present. Source

01 · The HTML change

<div class="case-marker">Measurement conditions</div>

Exact input excerpt · Original HTML ↓

02 · What the tool produces HTML

…
<p>Measurement conditions</p><p>Sensor A operated for 30 minutes. The measurement was repeated in the same environment, without remote resources or executed scripts.</p><p>The conclusion must be read with its unit, period, scope and caveat. Finding a word in an output is not enough to prove that the relationship was preserved.</p></article></div></div>

Excerpt identified by the corrected evaluator. Full output below.

03 · The documented observation

Heading text
Present
Heading markup
Text only
Heading level
No level detected
Section membership
Not evaluated

Verdict source: results.json · heading-en-2 / readability

Inspect the full evidence

The verdicts above come from corrected results.json. The raw file’s evaluation fields are historical and are not authoritative here.

results.json/cases/7/evaluation/relation/readability

Corrected verdict, unchanged
{
  "status": "ok",
  "tool_class": "content_extractor",
  "format": "html",
  "heading_relation": "text_only",
  "heading_level": null,
  "evidence": {
    "excerpt": "Measurement conditions"
  },
  "output_field": "readability.content",
  "output_sha256": "82182331487ce72ad6b4cb39fed4024217805600afc68a0ddc8aa0f6567ebd97"
}
Complete studied output field

readability.content

<div id="readability-page-1" class="page"><div><article><p>This synthetic document compares two markups while text, order, classes and surroundings remain identical. The data are fictional and describe neither Edikka nor a client.</p><p>Measurement conditions</p><p>Sensor A operated for 30 minutes. The measurement was repeated in the same environment, without remote resources or executed scripts.</p><p>The conclusion must be read with its unit, period, scope and caveat. Finding a word in an output is not enough to prove that the relationship was preserved.</p></article></div></div>
Archived version and options

Mozilla Readability 0.6.0 · Execution 2026-09-20

{
  "version": "0.6.0",
  "configuration": {
    "keepClasses": false,
    "charThreshold": 500,
    "disableJSONLD": false
  }
}

Archived runner · Python options

SHA-256 hashes
HTML input
4173dad4d266784865a6ed57bddde0f63604d5b192c97e4b434405a9427216ed
Evaluated output field
82182331487ce72ad6b4cb39fed4024217805600afc68a0ddc8aa0f6567ebd97

Complete raw output file ↗

Identical text and isolated intervention within this pair, according to the protocol witnesses. Translations are not independent observations. View pair witnesses.

LOOK FURTHER

Every result has a scope.

These observations do not rank tools. They do not measure overall accessibility, search ranking, or understanding or citation by AI.

Claims excluded by the protocol
The eight real pagesA separate corpus, with documented instability. ↗Evaluator counter-testsChecking evaluation without rerunning extractors. ↗Reproduce the runsA local procedure, separate from this interface. ↗