What causes the page's styling to break when an external JS file is loaded?

Currently, I am facing a situation where an external javascript file is being loaded onto the page based on a query parameter. The file includes UI components along with their styles. However, upon loading the file, it disrupts the styling of the entire page.

I am finding it difficult to comprehend why elements on the page share the same CSS classes but appear differently.

Page Layout Without External JS File

https://i.sstatic.net/4injN.png

Page Layout With External JS File

https://i.sstatic.net/BrcNf.png

Thank you for your assistance.

css css-selectors

Answer №1

When you're adding a new JavaScript file to your website, make sure to watch out for <style> tags within it. These styles are identified by the inline style elements you may have noticed in your images.

The existing styles on your page are also at an inline level, which means they compete with the new styles based on specificity. In this case, the rules from the conditionally added JavaScript file will take precedence over the ones from the base document. This is evident from the strikethroughs in your image - the conflicting rules are being loaded but ultimately overridden.

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