Thank you for your question!
This is typical for Thorium’s read-aloud function, which has limitations. It does not announce heading levels, <hr>, <aside>, <a>, or <sup> tags. Thorium reads out the text as it is displayed on the screen, as well as alt-text for images, if the EPUB includes those.
Thorium can also be used in conjunction with a screen reader such as NVDA—which announces heading levels, separators, and page numbers, for example. Here is a helpful video resource from NNELS demonstrating how Thorium is used with a screen reader: https://youtu.be/x2SbH_yZEyw
February 8, 2023 at 4:53 pm
Video title: Thorium Version 1.7: Demonstration with Screen-reader