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Using custom accessibility toolbars

From: Web Accessibility Principles

Video: Using custom accessibility toolbars

>> Now that we've installed these extensions for Firefox let's use them to test some pages. The first extension that we're going to test is the Web developer toolbar. Some of its features do not work for local pages, so we're going to test the page that we looked at in the previous chapter from the W3C. The web page that we're at is www.w3.org/wai/eo/2005/demo/before/index. Because some of the features in the Web Developer toolbar do not work for locally loaded pages make sure that you up load your pages to a testing server before using the extension.

Using custom accessibility toolbars

>> Now that we've installed these extensions for Firefox let's use them to test some pages. The first extension that we're going to test is the Web developer toolbar. Some of its features do not work for local pages, so we're going to test the page that we looked at in the previous chapter from the W3C. The web page that we're at is www.w3.org/wai/eo/2005/demo/before/index. Because some of the features in the Web Developer toolbar do not work for locally loaded pages make sure that you up load your pages to a testing server before using the extension.

The Web Developer toolbar is the third toolbar underneath the URL bar. The first item on its left is a disable button. Click on this button to expose a menu with options of things that you can disable on the page. You can scroll down and choose disable JavaScript, and then check the all JavaScript option. This will turn off all JavaScript on the page so you can make sure that it is still useable without scripting enables. Another thing that's useful to turn off is CSS. Click on the CSS button on the web developer toolbar.

Select the disable styles option, and then click on all styles. You'll see that the display of the page changes because CSS is no longer available. Some of the images have disappeared and the font formatting has changed. This is useful to make sure that your pages are still readable without styles applied. We can also turn off images. Click on the Images button, select Disable Images, and then select the All Images option.

All images on the page are now displayed as if they were broken. The space is still referred for them, but they are not displayed. You may also want to see which images on a page lack all attributes, which we'll talk about on a later movie. For that, click on the Images button, scroll down to the Outline Images option, and select Images Without All Attributes. This will put a red border around all images that do not currently have an all attribute. You can also view the all attributes of image that's do have one using the Images menu.

Click on Images again, and go to Display All Attributes. The all attributes will be listed in yellow boxes. This page has only a couple all attributes set. You can hover over the yellow box to see what the text is currently set to. You may also want to outline other elements on the page. There are a number of these options underneath the Outline menu. You can outline frames, headings, links, and so forth to make sure that you're marked up these pieces of content correctly. Underneath the Tools menu are links to validate your page against a number of W3C standards, as well as Section 508 accessibility rules.

Let's select the Validate Section 508 option. This opens a new tab with the contents of a report from cynthiasays.com, a web site accessibility checker. You can see the full results of its test. On the left side it gives you a description of each Section 508 rule. On the right side it tells you whether you have passed or not. In this case, you can see that we have not passed for image elements because they do not have all attributes, as we saw with the outline feature that we used earlier.

Now let's close this tab. Next, let's use some of the tools in the accessibility extension. This is the next toolbar down on the page. It contains many of the same tools that the Web Developer toolbar does, but there are some differences. For instance, when you click the navigation button you'll see a number of elements listed. Clicking on these items will bring up a list of each of these elements. Click on the Links option. This brings up a box showing all of the links on the page, what the text of the link is, and where it goes to.

These navigation options in this extension are useful because screen readers have functions just like this. You can use this to see what a screen reader user might see in their own list of links and make sure that the text makes sense. We'll talk more about that in a later movie. Close this box and go to the Style button. Click that and choose high contrast view one. This changes the view of the page to make the text easier to read for visually impaired users. It makes the text large and changes its color. If we scroll down the page you can see that some of the text does not change.

This is because the way the text has been coded does not allow for changes. This would show you that you would need to make changes to your CSS or other pieces of your page to make the text more changeable to user changes. Again, we'll talk about that in a later movie. The other two extensions we downloaded were Fangs, and the Color Contrast Analyzer. These do not show up as tool bars on Firefox, but these are available from the Context menu that appears when you right-click or on a Mac, Ctrl-click on the page. So that gives you an idea of some of the features available in the Web Developer and accessibility tool bars.

In the next movie we'll look at how to use the other tools that we've downloaded, Fangs and the Color Contrast Analyzer.

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This video is part of

Image for Web Accessibility Principles
Web Accessibility Principles

68 video lessons · 25785 viewers

Zoe Gillenwater
Author

 
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  1. 2m 0s
    1. Welcome
      1m 3s
    2. Using the exercise files
      57s
  2. 33m 15s
    1. What does accessibility mean?
      5m 51s
    2. How does accessibility help your users?
      3m 30s
    3. Experiencing a website via a screen reader
      5m 46s
    4. How does accessibility help you and your clients?
      3m 9s
    5. Overview of Section 508 standards
      5m 51s
    6. Overview of WCAG standards
      6m 4s
    7. Understanding consistency and semantic markup
      3m 4s
  3. 54m 31s
    1. Understanding screen readers and accessibility tools
      6m 12s
    2. Getting accessible browsers
      5m 41s
    3. Customizing Firefox for accessibility testing
      5m 53s
    4. Using custom accessibility toolbars
      5m 28s
    5. Using Fangs and the Color Contrast Analyzer
      5m 30s
    6. Accessibility tools to bookmark
      5m 53s
    7. Using automated accessibility checking tools
      4m 57s
    8. Setting up the JAWS screen reader on Windows
      6m 42s
    9. Using the VoiceOver screen reader on Mac OS X
      5m 52s
    10. Setting Dreamweaver accessibility preferences
      2m 23s
  4. 26m 12s
    1. Avoiding tables for layout
      3m 30s
    2. Using CSS for layout
      2m 40s
    3. Creating a fixed-width layout
      5m 51s
    4. Creating an elastic layout
      3m 51s
    5. Creating a liquid layout
      3m 4s
    6. Customizing a liquid layout
      7m 16s
  5. 1h 6m
    1. Specifying the language
      3m 43s
    2. Setting page titles
      2m 16s
    3. Setting headings and paragraphs
      9m 55s
    4. Styling headings
      9m 56s
    5. Hiding section headings from sighted users
      6m 41s
    6. Styling text for readability
      6m 41s
    7. Ensuring proper color contrast
      6m 36s
    8. Creating text emphasis
      4m 29s
    9. Indicating quotations
      4m 29s
    10. Creating basic lists
      4m 16s
    11. Styling lists
      7m 15s
  6. 1h 15m
    1. Using lists for navigation
      6m 45s
    2. Creating a horizontal navigation bar
      13m 25s
    3. Creating a vertical navigation bar
      11m 44s
    4. Adding skip navigation links
      12m 0s
    5. Hiding skip navigation links
      6m 17s
    6. Proper link text and title attributes
      6m 11s
    7. Opening new windows
      4m 28s
    8. Accessibility limitations of fly-out menus
      6m 30s
    9. Creating an accessible fly-out menu
      8m 38s
  7. 27m 55s
    1. Proper ALT text for navigation images
      4m 57s
    2. Proper ALT text for decorative images
      5m 19s
    3. Adding ALT text to an existing site
      6m 9s
    4. Adding ALT text to image maps
      5m 58s
    5. Describing complex graphics
      5m 32s
  8. 34m 1s
    1. Using tables for data
      3m 0s
    2. Creating header cells
      4m 5s
    3. Adding table captions and summaries
      9m 9s
    4. Styling tables
      5m 19s
    5. Applying header cells to complex tables
      6m 52s
    6. Adding id and headers attributes
      5m 36s
  9. 42m 7s
    1. Understanding form accessibility issues
      3m 7s
    2. Labeling form fields
      6m 9s
    3. Adding fieldsets and legends
      4m 42s
    4. Moving forms out of tables
      3m 44s
    5. Cleaning up a form's appearance
      4m 53s
    6. Aligning labels and fields using CSS
      9m 39s
    7. Indicating required fields
      6m 15s
    8. Dealing with CAPTCHA
      3m 38s
  10. 7m 29s
    1. The Text-Only technique
      3m 21s
    2. The Access Keys technique
      2m 35s
    3. The Tab Index technique
      1m 33s
  11. 18s
    1. Goodbye
      18s

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