When the mouse is moved to a list of options, on the right side of a border color, this how to write the

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Js to monitor the mouse moved to removed from the event

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To modify the CSS styles, or add element of dome, removed from the event trigger, removal of CSS styles, hidden dome element

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Structure on the red box should be on the left side of each child element, can use c3 hover control, also can use js mouseenter and mouseleave hide the mouse moving in and out of control and display

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Hover can use CSS to control the display or not

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Simple point, of jd directly to the home page code

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CSS hover can solve this problem

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Hover the CSS can solve, you can directly use the browser debugging to see the source code

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CSS hover, or mouseoverin out events

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Div1: hover. Div2 {
Background: red;
}
Using CSS hover the mouse over div1 regional div2 color red component