In order to insert accessible links via HTML code, in addition to elements and tags, you also need to indicate whether the target page opens in a new tab.
Headlines outline the section that follows. Their hierarchical arrangement organises the overall text and serves as a table of contents for blind users.
If the language is incorrectly labelled or not labelled at all, the screen reader and Braille display may display confusing information. Accessibility is different.
Even the best screen reader will fail on the web due to hurdles such as language changes, dialogue boxes, captchas and hyphenation if they are poorly displayed.