Our blog grew from 84 posts to 1,360 in a day. Then I read one live page instead of the source, counted tags, and found two <h1> elements on 500 of them. Both halves of the code were correct. Their sum was not, and no test could see it. Where the second heading came from The post template prints the title from frontmatter: < h1 > $ { esc ( fm . title )} < /h1 > Every article starts with its own heading, because that is what a m...