HTML Panel

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Revision as of 05:21, 17 April 2012 by Sebastianz (Talk | contribs) (Added description for faintly displayed elements)

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HTML Panel

The HTML panel displays the generated HTML/XML of the currently opened page. It differs from the normal source code view, because it also displays all manipulations on the DOM tree. On the right side it shows the CSS styles defined for the currently selected tag, the computed styles for it, layout information and the DOM variables assigned to it in different tabs.

Options Menu

This menu is reachable via the little arrow in the panel tab ( File:OptionsMenuArrow.png ) or by right-clicking on on the panel tab (since Firebug 1.9).

Option Preference Description
Show Full Text extensions.firebug.showFullTextNodes Toggles between full text display and text preview inside the Node View
Show White Space extensions.firebug.showTextNodesWithWhitespace Toggles display of white space characters inside the Node View
Show Comments extensions.firebug.showCommentNodes Toggles display of HTML comments inside the Node View
Show Basic Entities extensions.firebug.showTextNodesWithEntities Toggles display of basic HTML entity characters inside the Node View between the actual character representation and it's entity equivalent
Highlight Changes extensions.firebug.highlightMutations Toggles highlighting changes to the DOM structure inside the Node View
Expand Changes extensions.firebug.expandMutations Toggles expanding changes to the DOM structure inside the Node View
Scroll Changes Into View extensions.firebug.scrollToMutations Toggles scrolling to changes to the DOM structure inside the Node View
Shade Box Model extensions.firebug.shadeBoxModel Toggles between the display of a box model representing the contents, margin, padding and the border and a display of just a frame around the inspected element
Show Quick Info Box extensions.firebug.showQuickInfoBox Toggles the display of an info popup inside the page giving fast information about the currently inspected element

For more info about tweaks available in Firebug please see the full list of preferences.

Panel Toolbar

Break On Mutate

The "Break On Mutate" button gives you the possibility to stop JavaScript execution when any mutation of the HTML via the script occurs. If a mutation occurs, Firebug halts the script execution and jumps to the Script Panel to the line where the change happened.


Enabling the "Edit" mode by hitting the appropriate button lets you edit the HTML directly. Therefore it opens a text editor, which is filled with the node and its contents you currently had selected in the formatted (tree view) mode. After turning the edit mode off again the display switches back to the formatted mode, which now displays the changes made to the source code.

Element Path

Inside the panel menu there is a list of nodes, starting with the currently selected node and going up the element structure up to the root node of the document. The list looks like what some Web sites call a "breadcrumb" list. Hovering one of the nodes inside the list shows a highlighting box around the element inside the page and clicking on it selects the node inside the tree structure of the HTML panel. The context menu of each item in the list offers thereby the same options as the node's context menu inside the Node View.

Context Menu

Option Context Shortcut Description
Copy HTML Node - Copies the current node and all it's contents to the clipboard
Copy innerHTML Node - Copies the contents of the current node to the clipboard
Copy XPath Node - Copies the XPath to the current node to the clipboard
Copy CSS Path Node - Copies the CSS path (selector) of the current node to the clipboard
Log Events Node - Logs events (e.g. mousemove, click, focus, etc.) triggered at the current node to the Console Panel
Scroll Into View Node - Scrolls the page, so that the current node is visible
Add Attribute... Node in Node View - Starts inline editing to add a new attribute to the current node
Edit Attribute "<attribute name>"... Node attribute in Node View - Starts inline editing for the current node attribute
Delete Attribute "<attribute name>" Node attribute in Node View - Deletes the current node attribute
Edit HTML... Node in Node View - Switches to the Edit Mode and allows editing the contents of the current node
Delete Element Node in Node View Del Deletes the current node
Expand/Contract All Node in Node View Shift+*, * Expands or collapses all child nodes except <script>, <style> and <link> of the current node; pressing Shift while clicking or hitting * expands all nodes including them
Break On Attribute Change Node in Node View - Creates an HTML breakpoint for the current node, that triggers as soon as an attribute of that node is changed
Break On Child Addition or Removal Node in Node View - Creates an HTML breakpoint for the current node, that triggers as soon as a child node is added to or removed from it
Break On Element Removal Node in Node View - Creates an HTML breakpoint for the current node, that triggers as soon as it is removed
Inspect in DOM Tab Node in Node View - Lets you inspect the current node inside the DOM Panel

Node View

The body of the panel represents the document nodes of the page converted back into a source-like view. Note that this view is created from the live document: this is not a source view. The view can be based on any kind of markup, e.g. HTML, XML, or SVG graphics.

Single nodes can be expanded/collapsed by clicking the twisty besides them, using the + and - or the Right Arrow and Left Arrow keys.

Holding down Ctrl/ and clicking on a URL (e.g. of a <link> tag) opens the URL in a new tab.

Faintly displayed elements mean they are not visible inside the page.

Right-clicking on a node or a node attribute opens a context menu with different options.

When you mouseover the nodes a corresponding area of the page is highlighted:

  • yellow is margin area
  • darkblue/purple is padding area
  • lightblue is content

Side Panels

Besides node manipulation the HTML panel also offers a lot of information around the selected elements. This information appears in the side panels on the right, selected by another set of tabs.


The Style Side Panel shows all CSS styles, that are currently assigned to the selected node.


The Computed Side Panel shows all style values the user agent calculated for display while interpreting the given CSS information.


The Layout Side Panel gives a quick overview over the box model values for the selected node and offers a way to manipulate them.


You can see information about the DOM according to the selected node inside the DOM tab. This tab offers the full functionality of the DOM Panel. This also includes its Options Menu.