Browsers · Research guidance. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Text can be produced in different layers
A viewing page can contain ordinary website labels, captions supplied by the player and a system-generated caption window. These can look like text on the same screen while using different appearance controls. The setting that enlarges a programme description may therefore leave another text layer unchanged.
Observe what actually responds
Make a small page-zoom change and inspect one menu label and one caption line separately. Note which becomes larger. Avoid inferring that all text is fixed merely because one subtitle line did not change. The observation identifies a scope boundary and points towards the relevant appearance control.
Use documented caption controls
Google documents appearance and positioning for Chrome’s Live Caption bubble. Apple and Microsoft document system-caption appearance choices for their own features. A programme’s supplied track can have a separate player menu. Inspect the actual feature in use rather than applying a system caption setting to an unrelated custom subtitle renderer by assumption.
Consider readability and obstruction together
A larger caption window can cover the action or the button needed to pause. A larger webpage can also rearrange the menu around the player. Choose a readable size with an accessible route to the controls. If a setting helps the text but makes the overall task harder, adjust it in the specific layer instead of enlarging everything further.
Give a layered support description
Say whether the issue concerns page labels, supplied subtitles or generated captions, and name the setting already tried. Include whether the text was in the ordinary page, a floating video window or a system overlay. These details explain why apparently similar text might need different treatment without claiming universal caption support for every website.
Questions, answered
Does page zoom control every caption window?
No. System overlays and custom player captions can have separate controls.
What should a support note identify first?
The text source: page label, supplied subtitle or generated caption.