Sybre Waaijer

Hover Highlights is a simple WordPress plugin that adds a subtle highlight effect to the Gutenberg/Block Editor. When you hover over a block, it gets highlighted with a dashed outline and a box-shadow. The highlight disappears when you focus on the block to reduce distraction.
This plugin is ideal for content creators who want to visually distinguish individual blocks within the Block Editor.
The code and this readme are mostly written by ChatGPT.

Hover Highlights – Editor highlighting

Adds highlighting on hover with a distraction-free experience for the Gutenberg/Block Editor.

e1tekoap42

this highlighter has the following features:
<ul>
<li>works in frontend by using javascript ,so it has almost no pressure on the server side</li>
<li>support cache plugin</li>
<li>support UTF-8,GBK and GB2312 encoding search engine (eg:google.com,baidu.com)</li>
</ul>

Search engine keywords highlighter

highlight the keywords if visitor is from search engine

Hover Highlights – Editor highlighting vs Search engine keywords highlighter