Making your interview accessible
Web Accessibility is the practice of making your website usable by many different users, such as those who use keyboard controls or screen readers.
Making your guided interviews accessible is first and foremost about making them easy to understand and use. Following our advice about writing good questions can make your interview overall easier to understand and complete, which helps everyone!
Other parts of web accessibility involve writing the interview in a way that the user's browser and other accessibility tools (like screen readers) can understand. Docassemble handles many of these things for you, but there are some parts that you'll have to address when writing your interview.
To help you find accessibility problems in your interview you can use the WAVE browser extension, or if you want to check accessibility of your interview automatically, you can use the ALKiln testing framework.
Use colors that contrast strongly with their backgrounds
One thing that you have control over in your interviews is your interview "branding", including fonts, styles, and importantly, colors. Making sure the text colors and background colors that you choose have high enough contrast is important to both low-vision and sighted users. Web accessibility standards like WCAG 2 define the minimum proper color contrast between an element and it's background color as 4.5:1. For larger text like headings, the minimum is 3:1.
You can check that the colors you are using in your interview's branding have proper contrast with the following tools:
Use alt-text with images
To describe images in webpages, screen readers read out author-provided descriptions called alternative text, or "alt-text". Without alt-text, people visiting your page with screen readers won't get any of the benefits of the graphic. The W3 WAI group has a good decision tree on how to write alt-text.
In docassemble, you should set the
alt_text attribute of a DAFile, or use the
set_alt_text() function. If you are writing HTML directly, you can add an
alt property to any
img tags you use (see below).
<img src="my_image.png" alt="A drawing of a flowchart: the question is 'do you have any children?',
the option 'yes' leads to 'scenario 1', and the option 'no' leads to 'scenario 2'."/>
You should add alt-text to your organizations logo. This alt-text can be simple, such as "Organization A's logo", but it should be present.
Maintain consistent header increments
If you use headers in your question markdown, make sure that you always increment your header levels by one. For examples, always go from header level 2 to 3, and not 2 to 4. Screen readers have special features that let users navigate between different headers in order to navigate quickly, and skipped header levels can disorient users.
h1 in sub questions
There should only ever be one
h1 header on a page, and in docassemble, that header is the
question attribute. Because of that, you shouldn't use a
# header (or if you use HTML, an
<h1> tag) in a subquestion.
You might notice that the question header in Docassemble looks smaller than headers in the subquestion. This is because docassemble manually styles the question to
look like an
h3 header, even though it is really a
h1 header. If you want the headers in your subquestion, don't skip header levels until they "look right". Instead, you can manually use HTML and style them as such:
<h2 class="h4">Main Description</h2>
<h3 class="h5">More Details</h3>
Comboboxes, as implemented in docassemble, have several usability problems, especially with screen readers. We recommend that you don't use comboboxes in new interviews, instead using one of the below alternatives:
split out the combo box into two fields: a dropdown with the same fields and an additional "other" option, and a fill-in-the-blank text input hidden behind a
show ifwhen the dropdown is not "other". This only works if the list of predefined options is short and the user will expect to find an "other" option on the list.
- What is your role?: role_name
- Enter your role: role_other
split the combo box into three fields: a dropdown menu with options (like a list of courts inside the user's state), a checkbox that indicates the list doesn't apply, and a fill-in-the-blank text input hidden behind a
show if. This is appropriate if the list of options represents the most common selections, and there is an obvious "mode" switch. For example, the checkbox might read "My court is outside of Massachusetts".
- What is your court name?: court_name
- My court is outside of Massachusetts: outside_ma
- Enter your court's name: court_outside_ma_name
show if: outside_ma
if the combo box suggestions are validated by the interview, add some some of those suggestions into examples on the page (which makes them easier to discover for some users) and turn the field into a text input where the validation errors are descriptive.