Sorry it's late to edit. Actually the title is the HTML Page Title (but not the heading on the page) that was used by the HN bookmarklet. I usually check that

Sorry it's late to edit. Actually the title is the HTML Page Title (but not the heading on the page) that was used by the HN bookmarklet. I usually check that the site hasn't butchered the heading, but on mobile its hard to scroll through - for some reason the HN submit page only shows the first 50 characters of the title, although 80 are allowed.