Browser Diagnostics Ladder

Source to DOM Tree

A small article source becomes a DOM tree, then a simple rendered card.

Program

The first diagnostic ladder starts with source, reads the browser structure, names the diagnostic surface, checks the rendered result, and ends with a learner check.

source_to_dom_tree.html 
<article class="card">
  <h2>Order ready</h2>
  <p>Pack the receipt.</p>
</article>
DOM tree The DOM tree is the browser's structured version of the source elements.
rendered consequence The same structure becomes visible text and grouping on the page.