- Class
- C4 Informational
- Weight
- 0
- Severity on fail
- info
- Applies to
- Any engine
Scope and evidence
Evaluated on page (P). The book marks this requirement house convention. As a house convention it is off by default, carries no weight, and appears only when a team opts in.
Observations
Each condition has a stable code and a reason template. The evaluator fills the placeholders from observed values only; no sentence in a report is generated.
missing_dimensions{n} images on {url} lack width or height, for example {src}. The HTML Standard advises dimensions on lazy-loaded images; the check for all images is a house convention.
Sources, quoted
These are the passages the rule rests on, stored once in the knowledge base and emitted exactly as written. A citation marked for specific conditions appears only on findings with those codes.
“to prevent the page layout from shifting around after the image loads”
[WHATWG-EMBED] HTML Standard: 4.8 Embedded content (img, lazy loading) · 4.8.3 The img element · last updated Living Standard
https://html.spec.whatwg.org/multipage/embedded-content.html