Autoplay stays in the series; the next episode's player takes the keyboard

[Nawid3333]

His reports of 2026-10-11:

1. aniworld.cc: after season 3's last episode, autoplay went on to another series.

The next-episode search now stays in the series wherever the page's address names one (EpisodeLinks.seriesOf). That is the path before the first season or episode segment, e.g. /anime/stream/<series>/. A link counts as the series only if its own series part is the same. Sequels such as one-piece-2/… or one-piece-film-red don't count.

• After a season's last episode, autoplay goes on to the next season's first episode, when the page lists the season and links the next one. If the page links the next season's episodes, it takes the lowest one, which covers sites that number on across seasons.
• A gap in the season (a removed episode) is followed past, not taken as the season's end.
• The very next episode's link is followed in this tab even with target="_blank".
• On a series page whose links show the whole season, a "next episode" button (which could lead anywhere) is not pressed.
• After the series' last episode autoplay stops and says why:
  • in the player: "Last episode of the series: autoplay stopped";
  • in mpv: "Next video: the last episode of the series: autoplay stops".
• A page FastStream can't read says so instead, and only that case goes to the problem list.
• In MPV mode, the series end also stops the search before any hoster frame is asked (a hoster's links lead to other videos).

Replayed on the real aniworld pages (their live DOM, test Firefox):

• S3E12 stops;
• S3E11 → S3E12;
• S2E12 → S3E1;
• "previous" from S3E12 → S3E11 (1.3.82.86 took the "Staffel 3" link there).

2. After autoplay, F (and Space) did nothing until a click in the player.

The page had the keyboard. The player now takes it when FastStream went on to it by itself, and only then. Measured in Firefox:

• before: the page had the keyboard and F did nothing;
• now: the player has it and F goes fullscreen without a click.

That holds for the video in the page and in a hoster frame of another origin. WebDriver can't send a key two frames deep; a key sent inside the player goes fullscreen through both frames.

Texts are in all 16 languages (gemma4 drafts, checked by glm; Polish corrected).

Reviews: deepseek, kimi and glm each reviewed the change, and every finding was checked against the code. The real ones are fixed in the third commit, each with a test that fails without it. The false ones are listed in the conversation.

Tests:

• lint, typecheck, unit 2,378 passed.
• The new tests fail on the code before the fix (mutation-checked).
• e2e autoplay-next-episode in real Firefox 4/4, including:
  • a two-episode series: it stops after the last episode, says so, and the tab stays on the series;
  • F after autoplay: fullscreen without a click.

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