The order of CSS precedence shifts even when the class sequence is the same

In my development setup, I have a react component that is embedded within two distinct applications each with their own webpack configurations.

Within the component, I am utilizing a FontAwesome icon using the react-fontawesome library:

<FontAwesome name="chevron-left" className="viewtoggle" onClick={() => doSomething()} />

The issue arises when the 'viewtoggle' styles from one of the apps take precedence over the default FontAwesome CSS classes in one app, while in the other app it is the opposite, resulting in the 'viewtoggle' definitions for font-size and line-height being ignored.

Upon inspecting this behavior in the Chrome debugger, I notice that the classes on the span element appear to be in the correct sequence "fa fa-chevron-left viewtoggle" in both cases. However, there seems to be a difference in vertical order, suggesting varying precedence. What could be causing this discrepancy?

This inconsistency persists across multiple browsers ruling out a browser-specific issue. What other factors could potentially contribute to this differing behavior?

Update: I am seeking a resolution that does not involve meddling with FontAwesome internals or using !important declarations.

The desired outcome: https://i.stack.imgur.com/KDfIk.png

The undesired outcome: https://i.stack.imgur.com/27t0p.png

javascriptcssreactjswebpackfont-awesome

Answer №1

Why do the applied CSS rules have a different vertical order in the debugger, signifying a different precedence? What could be causing this?

According to @Turnip's comments, the discrepancy may be due to the files being loaded or defined in varying sequences. When selectors like .fa and .viewtoggle possess equal specificity, the latter one will take priority. To resolve this issue, you can enhance the specificity of the desired ruleset by adjusting it as follows:

.fa.viewtoggle { ... }

It is important to note that the arrangement of classes within the class string fa fa-chevron-left viewtoggle does not impact the specificity of the CSS selectors utilized. Nevertheless, the sequence can make a difference when employing an attribute selector for the class property, such as [class="fa viewtoggle"] versus [class="viewtoggle fa"]. For further insights, refer to this answer.

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