page-fidelity.js heading/action/content match is a substring test over the whole page MDL, so a wireframe heading counts as present without being a heading #158

What happens

project-bin/page-fidelity.js scores headings, actions and content blocks with one test (~l.412):

const hit = txt => { const w = words(txt); return w.length ? w.filter(x => corpus.includes(x)).length / w.length >= 0.6 : true; };

Here corpus is the entire normalised page MDL: page name, entity and attribute names, microflow names, captions and comments. words() keeps only words longer than 3 characters. includes is a substring test. So:

• A wireframe H2 "Case overview" is "present" on any page named Case_Overview, whether or not the page renders that heading.
• A one-word heading, after the >3-char filter, is present if the word occurs anywhere, even inside an identifier (case ⊂ CustomerCase).
• 60% of the words is enough, so a three-word heading needs only two of them anywhere.

The dimension can therefore read green for a heading, button or block the page does not show.

Evidence (card-disbursement requirements-driven build, 2026-09-25)

The style-gallery page scored 80% with this in play. A wireframe H2 counted as present because page text shared its words. The project's rule since: read the miss list and the LOOK, never the percentage alone.

Suggested fix

• Match headings against caption strings only: Caption:/Content: literals of dynamictext/statictext and title widgets, plus the page Title:. Match actions against button captions.
• Match on whole words, not substrings.
• For short labels (fewer than 3 kept words) require all words.
• Keep the substring corpus only for bindings, where identifiers are the point.

Filed rather than fixed because it changes every existing project's scores. It needs golden page MDL plus a wireframe pair captured from a real project to show the before/after.

Files

• project-bin/page-fidelity.js: norm/words (~l.220), score()

Related: the class-dimension gaps of the same scorer are filed separately (#157).