A11y: Add lang attribute to iframe document

Description

WCAG Criteria

3.1.1

Acceptance Criteria

1. Add default lang attribute to H5P iframe document.
2. Must match content language.

Acceptance Criteria

None

Assignee

Unassigned

Reporter

Frode Petterson

Labels

Funding

None

Code reviewer

None

Released

None

Fix versions

Priority

High
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