Project: accessible inspection report

Last updated: 5 Oct 20268 min read

project

Build an inspection report for case 47 with a photo of a cracked valve, a four-week district chart, and a short procedure clip. The photo’s alternative must convey the crack where that fact is not already stated; repeated decorative artwork gets an empty alternative, and an image-only zoom action names the action. The chart’s summary and values derive from the same filtered data revision as its visual bars. The procedure clip has reviewed captions, a descriptive transcript, and controls that can be reached and operated with a keyboard. The report uses meaningful headings, distinct navigation landmarks, and a skip path. Client-side navigation into the report sets a useful title and focus target. The case authorization rule applies equally to text equivalents, media tracks, and chart values.

Build contract

Write the task each visual or audio element supports, then test it with that sensory channel unavailable.
Change a chart filter and revision; assert that the graphic, result sentence, and data list agree.
Recut the video and ensure old captions or transcripts cannot be published as current.
Use keyboard and assistive-technology navigation across direct load, client route change, error, and back navigation.

Implementation checkpoint

function mediaAndChartReady(reportRevision, chartRevision, captionRevision) {
  return reportRevision === chartRevision && reportRevision === captionRevision;
}
console.log(mediaAndChartReady(8, 8, 7));
// Output: false

Cost and boundaries

Generating a text view of n chart records costs O(n) time and output space, while an image alternative is constant-sized per placement. A long report may need paged data or an export so the equivalent does not become a wall of numbers. Captions and transcripts add editorial and version-review work; playback transfer remains dominated by media bytes. Semantic landmarks have negligible runtime cost, but moving focus on every re-render can disrupt users, so apply it only on meaningful route arrival. Track mismatched revisions, keyboard task completion, and unauthorized access attempts to equivalent routes.

Failure drill

Remove the photo and ask a reviewer to locate the crack. If the text path cannot support the decision, revise it. Disable chart color and hover and ask which district crossed its threshold. Change the filter without updating the summary and ensure a test detects the mismatch. Publish a video revision with an older caption track and expect a release failure. Put the clip behind case authorization while leaving transcript access public and verify that the security check rejects it. Finally move from search to the report with keyboard only; focus must land on a present route target.

Acceptance checks

Photo and action alternatives convey purpose without repetitive noise.
Chart text and visual values share filter, revision, and access scope.
Reviewed media alternatives match the published clip.
Landmarks, skip path, title, and focus support every route state.

Common Mistakes

Using one file-level alternative regardless of context.
Calling a chart accessible when it only says chart.
Treating generated captions as reviewed technical instructions.
Leaving focus on an unmounted search result.

web-tech

web-development