Bing tests blue underline and magnifying glass icon on tab menu

Bing is testing a new styling for its All tab menu. Normally, the tab appears in black text. However, I noticed it now appears with a blue underline and a magnifying glass icon instead of the usual black styling.

I spotted this today.

Here is a screenshot showing the blue underline with the magnifying glass icon.

Here is what the normal styling looks like.

Bing has been testing several changes to its tab menu and header recently, and this could be part of that broader pattern. A blue underline with an icon like this could help draw more attention to the active tab.