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Detailed Element Layout View
Stage Complete
Status In progress
Release target Firefox 15
Health OK
Status note `


Product manager Kevin Dangoor
Directly Responsible Individual Dave Camp
Lead engineer Paul Rouget
Security lead `
Privacy lead `
Localization lead `
Accessibility lead `
QA lead Paul Silaghi
UX lead `
Product marketing lead `
Operations lead `
Additional members `

Open issues/risks


Stage 1: Definition

1. Feature overview

The browser goes through quite a few computations in order to decide how big an element should be on the page. The purpose of the Layout tool is to help the user see detailed information about the final dimensions of a page element.

Some layout information will be displayed in the Highlighter directly (like after this feature lands, however). Due to space constraints, all of the useful numbers cannot be displayed there. The Layout tool will provide the details that can't be easily represented over the page element itself.

2. Users & use cases

As with the Style Inspector, the use cases are similar:

  1. a user is trying to fix a problem with their element's dimensions
  2. a user is trying to learn about how another page is designed

3. Dependencies


4. Requirements




Stage 2: Design

5. Functional specification

Invoking the Layout Tool

In the Highlighter, click a "Layout" button on the Highlighter toolbar. The Layout tool will appear in the sidebar.

Layout View Display


The Layout tool displays the following information about the selected element (F1):

  1. upper left corner coordinates (relative to the top left of the page)
  2. outer box size (including everything below)
  3. margins
  4. borders
  5. padding
  6. inner box size (content size)

(optional) The box is represented with an aspect ratio that is similar to that of the original element (F2). This makes it easier for the user to mentally associate the numbers with the dimensions of their element.

6. User experience design


Stage 3: Planning

7. Implementation plan

See bug 683954

8. Reviews

Security review


Privacy review


Localization review




Quality Assurance review


Operations review


Stage 4: Development

9. Implementation


Stage 5: Release

10. Landing criteria


Feature details

Priority P1
Rank 5
Theme / Goal `
Roadmap Developer Tools
Secondary roadmap `
Feature list Desktop
Project `
Engineering team DevTools

Team status notes

  status notes
Products ` `
Engineering ` `
Security sec-review-needed dchan
Privacy ` `
Localization ` `
Accessibility ` `
Quality assurance ` Test Plan
User experience ` `
Product marketing ` `
Operations ` `