What is the best way to combine XHTML files in Java while handling any potential CSS conflicts that may arise

Looking for a way to concatenate XHTML files in Java and resolve CSS collisions at runtime? The challenge is to merge files with different style definitions without losing any content. JSoup seems promising but falls short on managing style conflicts automatically.

Are there other open source frameworks or APIs that can simplify this task?

Allow me to illustrate with an example of what I am aiming to achieve.

<!-- File 1 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <style>
      h1 { color: red; }
      .default-stroke { font-weight: bold; }
      #custom-id { font-style: normal;  }
      div.align { position: absolute; right: 800px; width: 300px; }
    </style>
  </head>
  <body>
    <h1>HTML file 1 Header 1 tag</h1>
    <div class="align">
      <p id="custom-id" class="default-stroke">PARAGRAPH inside DIV</p>
    </div>
  </body>
</html>

<!-- File 2 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <style>
      h1 { color: blue; }
      .default-stroke { font-weight: italic; }
      div.align { position: absolute; right: 1000px; width: 300px; }
    </style>
  </head>
  <body>
    <h1>HTML file 2 Header 1 tag</h1>
    <div class="align">
      <p id="custom-id" class="default-stroke">PARAGRAPH inside DIV</p>
    </div>
  </body>
</html>

<!-- File 3 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <style>
      h1 { color: green; }
      .default-stroke { font-weight: 900; }      
      div.align { position: absolute; right: 1200px; width: 300px; }
    </style>
  </head>
  <body>
    <h1>HTML file 3 Header 1 tag</h1>
    <div class="align">
      <p id="custom-id" class="default-stroke">PARAGRAPH inside DIV</p>
    </div>
  </body>
</html>

Notice the conflicting CSS styles (h1, .default-stroke, and div.align) in each XHTML file. Resolving these clashes while preserving all style definitions is crucial. Should I consider implementing CSS namespaces in my code?

Handling CSS conflicts is no simple feat. Any guidance or suggestions would be greatly appreciated.

Thanks!

javacsshtmlxhtmlconcatenation

Answer №1

<style scoped> can be a solution. Separate the contents of each HTML file into their own sections and include the style blocks with scoped attributes. For more information, refer to https://developer.mozilla.org/en-US/docs/Web/HTML/Element/style

<section>
  <style scoped>
    h1 {
      color: red;
    }
    .default-stroke {
      font-weight: bold;
    }
    #custom-id {
      font-style: normal;
    }
    div.align {
      position: absolute;
      right: 800px;
      width: 300px;
    }
  </style>
  <h1>Title for HTML file 1</h1>
  <div class="align">
    <p id="custom-id" class="default-stroke">Text inside DIV</p>
  </div>
</section>
<section>
  <style scoped>
    h1 {
      color: blue;
    }
    .default-stroke {
      font-weight: italic;
    }
    div.align {
      position: absolute;
      right: 1000px;
      width: 300px;
    }
  </style>
  <h1>Title for HTML file 2</h1>
  <div class="align">
    <p id="custom-id" class="default-stroke">Text inside DIV</p>
  </div>
</section>
<section>
  <style scoped>
    h1 {
      color: green;
    }
    .default-stroke {
      font-weight: 900;
    }
    div.align {
      position: absolute;
      right: 1200px;
      width: 300px;
    }
  </style>
  <h1>Title for HTML file 3</h1>
  <div class="align">
    <p id="custom-id" class="default-stroke">Text inside DIV</p>
  </div>
</section>

Note: This method may not work in all browsers currently.

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