Problem:

The aim and purpose of every link should be clear from the link text or be
determinable from the direct context of the link. Blind users who navigate from link to link get the link texts read aloud and can easily decide whether they want to follow a link in the case of meaningful link texts. If the link text itself is not meaningful, the immediate context should at least be easy to determine for screen reader users.
Screen readers offer the possibility of listing all links on the page and thus a quick overview, even if the page is otherwise difficult to access. However, this technique does not work if all link texts are the same and do not provide sufficient information about the link target.

1. Menu Zabbix Logo
The code violates WCAG 2.4.4 Link Purpose (In Context) because the link text (or link name) is not present for assistive technologies:
• Problem: The link target elements are empty div containers with CSS classes
(zabbix-logo-sidebar) that do not contain semantic text. Screen readers can
Therefore not find an understandable name for the purpose of the link.
• As a result, screen reader users may only hear "link" or a generic term without
understanding the context of the dashboard link.

2. Page browserwarning.php:
The link texts are not perceptible to screen reader users because there are no link targets within the <a> element.

Solution: