JQury slideToggle flashing problem and solution_jquery

1. Solution
Configure on the page as follows

Where "http://www.w3.org/TR/html4/loose.dtd" is required, if this is missing There is still a flickering problem in the sentence. I don’t know exactly why
I checked it and it seems that this sentence involves regulations. If anyone sees this post and knows the reason, please leave a message, thank you
2. Example
[The following is an example]

Copy code The code is as follows:

< body>

Basic data

Employee Management

Role Management

Permission Management

News Management

Check news

;a href="#">Add news