This code defines a simple webpage using XHTML that is...

August 28, 2025 at 07:36 AM

<head xmlns="http://www.w3.org/1999/xhtml">
  <style id="xml-viewer-style">
    /* Copyright 2014 The Chromium Authors
     * Use of this source code is governed by a BSD-style license that can be
     * found in the LICENSE file.
     */
    
    :root {
      color-scheme: light dark;
    }
    
    div.header {
        border-bottom: 2px solid black;
        padding-bottom: 5px;
        margin: 10px;
    }
    
    @media (prefers-color-scheme: dark) {
      div.header {
        border-bottom: 2px solid white;
      }
    }
    
    div.folder &gt; div.hidden {
        display:none;
    }
    
    div.folder &gt; span.hidden {
        display:none;
    }
    
    .pretty-print {
        margin-top: 1em;
        margin-left: 20px;
        font-family: monospace;
        font-size: 13px;
    }
    
    #webkit-xml-viewer-source-xml {
        display: none;
    }
    
    .opened {
        margin-left: 1em;
    }
    
    .comment {
        white-space: pre;
    }
    
    .folder-button {
        user-select: none;
        cursor: pointer;
        display: inline-block;
        margin-left: -10px;
        width: 10px;
        background-repeat: no-repeat;
        background-position: left top;
        vertical-align: bottom;
    }
    
    .fold {
        background: url("data:image/svg+xml,&lt;svg xmlns='http://www.w3.org/2000/svg' fill='%23909090' width='10' height='10'&gt;&lt;path d='M0 0 L8 0 L4 7 Z'/&gt;&lt;/svg&gt;");
        height: 10px;
    }
    
    .open {
        background: url("data:image/svg+xml,&lt;svg xmlns='http://www.w3.org/2000/svg' fill='%23909090' width='10' height='10'&gt;&lt;path d='M0 0 L0 8 L7 4 Z'/&gt;&lt;/svg&gt;");
        height: 10px;
    }
  </style>
</head>

<body xmlns="http://www.w3.org/1999/xhtml">
  <div id="webkit-xml-viewer-source-xml">
    <Error xmlns="">
      <Code>AccessDenied</Code>
      <Message>Access Denied.</Message>
      <Key>/</Key>
      <RequestId>SZZ4CIJI4QQGVSSH</RequestId>
    </Error>
  </div>
  <div class="header"><span>This XML file does not appear to have any style information associated with it. The document tree is shown below.</span><br /></div>
  <div class="pretty-print">
    <div class="folder" id="folder0">
      <div class="line"><span class="folder-button fold"></span><span class="html-tag">&lt;Error&gt;</span></div>
      <div class="opened">
        <div class="line"><span class="html-tag">&lt;Code&gt;</span><span>AccessDenied</span><span class="html-tag">&lt;/Code&gt;</span></div>
        <div class="line"><span class="html-tag">&lt;Message&gt;</span><span>Access Denied.</span><span class="html-tag">&lt;/Message&gt;</span></div>
        <div class="line"><span class="html-tag">&lt;Key&gt;</span><span>/</span><span class="html-tag">&lt;/Key&gt;</span></div>
        <div class="line"><span class="html-tag">&lt;RequestId&gt;</span><span>SZZ4CIJI4QQGVSSH</span><span class="html-tag">&lt;/RequestId&gt;</span></div>
      </div><span class="folded hidden">...</span>
      <div class="line"><span class="html-tag">&lt;/Error&gt;</span></div>
    </div>
  </div>
</body>

This code defines a simple webpage using XHTML that is styled with embedded CSS. It primarily functions to display an XML document in a visually structured manner. Here's a breakdown of its functionality:

1. XML Document Styling

The code uses an embedded <style> block to define CSS rules that style the visualization of XML content.
The XML is presented as a hierarchical structure with collapsible/expandable elements (simulated with visual cues like arrows or folder icons using inline SVG images).
The :root style rule declares the color-scheme as both light and dark, meaning it adapts to the user's system color scheme preference.
The @media (prefers-color-scheme: dark) block adjusts styles for dark mode, specifically making the border color white in dark mode.

2. XML Content Representation

The <body> contains the XML content to be displayed in the browser.
The actual XML data is nested within <div> tags and formatted with class names such as folder, line, html-tag, etc.
For easier readability:
- XML tags like <Error>, <Code>, etc., are wrapped in <span> elements with the class html-tag.
- The hierarchical structure is padded/indented for clarity using CSS rules (e.g., .opened adds a left margin).

3. Interactivity and Folder Icons

Expandable/collapsible folder functionality is visually implemented:
- fold and open classes use embedded SVG icons to depict collapse/expand buttons (arrows pointing down and right, respectively).
Clicking on these icons (via .folder-button) would theoretically toggle the visibility of nested elements (if supported by additional JavaScript, which is not included in this snippet).

4. Hidden XML Data

The raw XML content is hidden on the page using the #webkit-xml-viewer-source-xml { display: none; } rule.
This suggests that this implementation primarily reformats raw XML into a styled and user-friendly view.

5. Displayed Error Message

The <div class="header"> shows a message at the top if the XML file lacks a designated stylesheet:
"This XML file does not appear to have any style information associated with it. The document tree is shown below."
Following this, the browser renders the XML content in a styled format.

6. Error Description

The specific example XML displayed represents an "Access Denied" error (standard with some cloud-based storage services like S3). It includes:
- <Code>: Status indicating "AccessDenied."
- <Message>: Explanation text "Access Denied."
- <Key>: A reference to the root path /.
- <RequestId>: A unique request identifier.

Summary:

This code is part of a custom XML viewer, likely implemented in a browser environment to prettify and display raw XML files. It structures XML data hierarchically, allows for customization (e.g., dark/light mode), and simulates interactivity (though no JavaScript is included to enable dynamic behavior).

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