Worked example by Ali Karabüyük, 2026-10-06. Data: NASA GISTEMP v4 annual global temperature anomaly 1880–2025 (public domain), via datasets/global-temp
(data/annual.csv, SHA-256 c9f98d4dfb6a985d…). All values below were produced by the scripts in the zip.
| Measure | Before | After |
|---|---|---|
| axe-core violations (rules / nodes), 1280 px | 7 / 13 | 0 / 0 |
| axe-core violations (rules), 320 px | 7 | 0 |
| Page width at 320 px viewport | 1008 px | 320 px |
| Smallest chart text (rendered) | 7.64 px (legend in PNG) | 14 px (SVG, at 320 px) |
| Smallest HTML text | 10 px | 14 px |
| Line series vs white (non-text 3:1) | 1.85:1, 2.43:1 | 3.58:1, 14.64:1 |
| Line series vs each other | 1.31:1 | 4.09:1 |
| Line series ΔE2000 normal / deutan / protan / tritan | 61.9 / 3.1 / 17.6 / 58.6 | 53.1 / 61.3 / 50.0 / 58.6 |
| Bar colours below 3:1 vs white | 8 of 15 (min 1.12:1) | 0 of 2 (min 3.58:1) |
| Bars: smallest ΔE2000 between neighbours, protan | 0.8 | 50.0 |
| Annual values available as text | 0 / 146 | 146 / 146 |
| Decade values available as text | 0 / 15 | 15 / 15 |
| Infographic key numbers as text | 0 / 2 | 2 / 2 |
| Chart images with accessible name | 0 / 3 | 2 / 2 (+15 named bars) |
| PDF/UA-1 (veraPDF) | not compliant, 9 failed checks | compliant, 0 failed checks |
| PDF Figure tags with /Alt | 0 / 3 | 2 / 2 |
| PDF tables (TH with Scope) | 0 | 2 tables, 168 TH |
color-contrast (serious, 5 nodes) – Elements must meet minimum color contrast ratio thresholdsdocument-title (serious, 1 nodes) – Documents must have <title> element to aid in navigationhtml-has-lang (serious, 1 nodes) – <html> element must have a lang attributeimage-alt (critical, 3 nodes) – Images must have alternative textlandmark-one-main (moderate, 1 nodes) – Document should have one main landmarkpage-has-heading-one (moderate, 1 nodes) – Page should contain a level-one headingregion (moderate, 1 nodes) – All page content should be contained by landmarksAfter: none at 1280 px and at 320 px.
5-1 ×1 – The PDF/UA version and conformance level of a file shall be specified using the PDF/UA Identification extension schema7.1-3 ×2 – Content shall be marked as Artifact or tagged as real content7.1-9 ×1 – The Metadata stream in the document's catalog dictionary shall contain a dc:title entry, where dc is the recommended prefix for the Dublin Core metadata schema as defined in the XMP specification, which clearly identifies the document7.18.1-2 ×1 – An annotation (except Widget annotations or hidden annotations, or those having rectangle outside the crop-box) shall have either Contents key or an Alt entry in the enclosing structure element7.18.5-2 ×1 – Links shall contain an alternate description via their Contents key as described in ISO 32000-1:2008, 14.9.37.3-1 ×3 – Figure tags shall include an alternative representation or replacement text that represents the contents marked with the Figure tag as noted in ISO 32000-1:2008, 14.7.2, Table 323After: compliant, 0 failed checks (profile: PDF/UA-1 validation profile).
tagged=True)