Is there a way to extend the styles applied to elements after the page has finished loading?

I have created an application with a element positioned at the top of the page. Directly below this element is another div.

Upon clicking a button within the first element, HTML content from a website is loaded into the second div, bringing along all its scripts and CSS which get injected into the document.

The issue arises when this imported CSS conflicts with the styles of my first element. For example, if the website's CSS alters the body margin:

body{margin:0 8px!important}

How can I prevent this interference dynamically for my first element?

I am unable to simply use:

#element1{
    margin: 0 -8px;
}

since it's not a dynamic solution as other websites may have different parameters. Any alternative approaches?

javascriptcss

Answer №1

There are a couple of potential solutions for this scenario (that I am aware of):

Option one - Utilizing an iframe

Include an iframe element within your second div, allowing you to load another HTML site into the iframe. By doing this, the scripts and CSS will only affect the content within the iframe, keeping the main website separate.

<html>
  <body>
    <div class='element'>
      <div><iframe><!--this is where other website fills in --> </iframe></div> 
    </div>     
  </body>
</html>

Option two - Implementing CSS priorities rule

According to CSS rules, the file referenced last in the HTML document will take precedence. Therefore, structure your HTML like so:

<html>
  <body>
    <div class='element'>
      <div> <!--this is where other website fills in --> </div> 
    </div>
  <!-- your custom CSS goes here.-->
  </body>
</html>

Essentially, placing your custom CSS lower in the HTML hierarchy should suffice.

Note: Adding your CSS at the bottom could impact the user interface if the page contains a significant amount of other HTML. Since the CSS is loaded last, the HTML may initially appear unstyled until the CSS loads. To mitigate this, isolate any overriding CSS into a separate file, reference it at the bottom, and keep your regular styles in the head section.

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