Markup Viewer
UtiliStudio Workspace ToolFormat, validate, and inspect HTML and XML documents in a dedicated workspace. Features syntax error detection, tree inspection, and safe preview.
Key Capabilities
HTML & XML Beautification
Transform single-line or irregularly indented HTML and XML into cleanly formatted structures with 2-space or 4-space indenting.
Syntax & Tag Validation
Instantly detect unclosed tags, mismatched element pairings, duplicate attributes, and syntax anomalies with line numbers.
DOM Tree Exploration
Navigate hierarchical node relationships, inspect parent-child nesting, and review element attribute sets.
Sandboxed HTML Preview
Safely visualize rendered HTML snippets in an isolated, script-sanitized container directly in your workspace.
How to Use Markup Viewer
Paste HTML or XML code
Input your unformatted markup snippet, template, or full document into the code editor.
Format or minify markup
Choose Beautify to format tag hierarchy or select Minify to compact the document for production delivery.
Review validation & DOM tree
Check syntax feedback for missing closing tags or switch to the tree view to inspect document node structures.
Preview or copy output
Switch to the sandboxed preview tab to verify rendered output, or copy clean markup to your clipboard.
Practical Examples
Unformatted HTML Snippet to Cleanly Indented Markup
Compressed or unformatted HTML snippets are structured with consistent tag indentation and attribute alignment.
<section class="hero"><div class="container"><h1>UtiliStudio</h1><p>Developer workspace</p><button class="btn">Launch</button></div></section><section class="hero">
<div class="container">
<h1>UtiliStudio</h1>
<p>Developer workspace</p>
<button class="btn">Launch</button>
</div>
</section>Common Use Cases
Cleaning Minified Web Templates
Expand minified component templates, email HTML, and CMS code blocks into easily editable, readable markup.
Validating XML Feeds & Documents
Check RSS feeds, SVG graphics, sitemaps, and SOAP payloads for strict XML well-formedness and closing tag balance.
Inspecting Complex DOM Nesting
Explore deeply nested document trees to detect orphaned container tags and layout-breaking hierarchy errors.
Isolated HTML Snippet Testing
Verify how styled HTML fragments render visually without affecting your surrounding application styles.
Frequently Asked Questions
Which markup formats can I inspect and format?
Markup Viewer supports standard HTML documents, HTML component fragments, XML feeds (RSS, Atom), SVG markup, and general XML configuration payloads.
How does markup validation detect structural errors?
The parser checks the tokenized tag stream to identify unclosed tags, void element misuse, mismatched opening and closing tags, and unquoted or invalid attribute names.
Is the HTML preview secure for untrusted input?
Yes. Preview rendering occurs inside an isolated, sanitized container that strips active script tags, event handlers, and unsafe attributes before display.
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Ready to use Markup Viewer?
Launch the full workspace tool directly in your browser.