[kwy404]

The README says adding no-title removes the title attribute, but that only works if no-title is there before the first render. If it is added later, the title from the earlier render stays:

const el = document.createElement('relative-time')
el.datetime = new Date().toISOString()
document.body.append(el)
// later
el.noTitle = true
// before: title="Nov 10, 2026, 1:29 AM GMT+4" is still there
// after: no title attribute

The leftover title also goes stale: if datetime changes while no-title is set, the element keeps the title of the old date.

update() only skipped setting the title when noTitle was true, it never removed one that was already there. The fix removes the title attribute in update() when no-title is present. This is inside the !this.#customTitle branch, so a custom title is still kept, as before. Removing no-title sets the generated title again, same as before.

One behavior change to note: an element rendered with both no-title and a title that is exactly the generated title (for example the same string rendered by the server) now has that title removed, because it cannot be told apart from a generated one. A different custom title is not touched.

After this change, an element that gets no-title later fires relative-time-updated the same way as one that had no-title from the start: on each update, with newTitle set to the computed title and oldTitle empty. Removing the title itself does not fire an event, because the computed title did not change.

Tests: added tests for adding no-title after render (fails before the change, passes after), keeping a custom title when no-title is added, and getting the title back when no-title is removed. I ran the full suite (web-test-runner, Chromium) and npm run lint (tsc --noEmit and eslint). My machine's locale is not English, so I ran the suite with the browser context locale set to en-US (as in CI): 667 passed on this branch, 664 on main. With the unmodified config the same 133 locale-dependent tests fail on both main and this branch.

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