When the UI Element is clicked, it should add the class "open" to the list item (li), causing it to open in a collapsed state. However, this functionality does not seem to be working in the xxx.component.html file.
Screenshot
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When the UI Element is clicked, it should add the class "open" to the list item (li), causing it to open in a collapsed state. However, this functionality does not seem to be working in the xxx.component.html file.
Screenshot
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It seems like the root of your issues could be related to the way you have declared your CSS in the index component. Angular follows an encapsulated or scoped approach for CSS.
To resolve this, consider moving your CSS to styles.css or refer to the official guide on how to use host-context (https://angular.io/guide/component-styles#host-context) or disabling encapsulation (https://angular.io/guide/component-styles#view-encapsulation)
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