Date of Current Version: 04 Feb 2011
Latest Version (HTML): http://inclusivedesign.ca/accessible-office-documents/ooimpress
At the time of testing (September 20, 2010), OpenOffice Impress provides a set of accessibility features that is sufficient to enable the production of accessible digital office documents. However, OpenOffice Impress does not include an accessibility checking feature.
You should use these techniques when you are using Impress to create documents that are:
If you are creating forms, web pages, applications, or other dynamic and/or interactive content, these techniques will still be useful to you, but you should also consult the W3C-WAI Web Content Accessibility Guidelines (WCAG 2.0) because these are specifically designed to provide guidance for highly dynamic and/or interactive content.
The default file format for Impress is ODF Presentation (ODP).
In addition, Impress offers many other presentation processor and web format saving options. Most of these have not been checked for accessibility, but some information and/or instructions are available for the following formats in Technique 12:
We have tried to formulate these techniques so that they are useful to all authors, regardless of whether they use a mouse. However, for clarity there are several instances where mouse-only language is used. Below are the mouse-only terms and their keyboard alternatives:
Following these techniques will increase the accessibility of your documents, but it does not guarantee accessibility to any specific disability groups. In cases where more certainty is required, it is recommended that you test the office documents with end users with disabilities, including screen reader users.
The application-specific steps and screenshots in this document were created using OpenOffice Impress (ver. 3.2.1, Windows XP, Aug. 2010) while creating an ODT document. Files can also be easily saved as other file formats (see Technique 12).
All office documents start with a template, which can be as simple as a blank standard-sized page or as complex as a nearly complete document with text, graphics and other content. For example, a “Meeting Minutes” template might include headings for information relevant to a business meeting, such as “Actions” above a table with rows to denote time and columns for actions of the meeting.
Because templates provide the starting-point for so many documents, accessibility is critical. If you are unsure whether a template is accessible, you should check a sample document produced when the template is used (see Technique 11).
OpenOffice Impress’s default template for new documents is a blank presentation. The basic installation also includes blank business card and blank label templates. These are all accessible by virtue of being blank. As well, you may create your own templates.
Note: Only use these steps if you have an accessible template available (e.g. that you previously saved). Otherwise, simply open a new (blank) document.
In order for assistive technologies (e.g., screen readers) to be able to present your document accurately, it is important to indicate the natural language of the document. If a different natural language is used for a paragraph or selected text, this also needs to be clearly indicated.
Instead of creating each slide in your presentation by starting from a blank slide, check whether there is a suitable built-in layout.
Note: The built-in layouts can be more accessible to users of assistive technologies because they technologies sometimes read the floating items on the slide in the order that they were placed on the slide. The built-in layouts have usually taken this into account (e.g., “Title” first followed by other items, left to right and from top to bottom). If you create slide layouts from scratch, it is sometimes difficult to keep track of the order elements were placed.
You should make use of the quick styles that are included with the office application (e.g., pre-defined heading fonts and characters) before creating your own styles or using the character formatting tools directly. Quick styles help your readers understand why something was formatted in a given way, which is especially helpful when there are multiple reasons for the same formatting (e.g., it is common to use italics for emphasis, Latin terms and species names).
Note: While office application suites support headings in much the same way, the named styles often differ.
Impress provides quick styles for theme fonts, but applying these directly to text does not define the text as a heading or body font. To define the font for headings and body text, you need to apply these characteristics to the presentation theme.
Impress provides named styles for “Heading”, “Title”, etc., but not for strong and emphasis.
If a layout must be customized, it is recommended that Master Slides be used.
Every slide layout in a presentation is defined by its master slide. A master slide determines the formatting style for various elements of the slide layout. This includes font styles, character formatting, and the positioning of elements. Essentially, each master slide acts as a design template for the slide layout.
If you edit any aspect of the slide layout in the master slide, the change will affect all slides that were created based on it. For this reason, it is good practice to edit the master slide and use the slide layouts before building individual slides. It is essential that you create and use master slides that meet the accessibility requirements outlined in this document.
Many presentation applications create content composed almost exclusively of "floating" objects. This means that they avoid the transitions between in-line content and secondary "floating" objects (text boxes, images, etc.) that can cause accessibility issues in word processors.
However, when you are working with "floating" objects, it is important to remember that the way objects are positioned in two dimensions on the screen may be completely different from how the objects will be read by a screen reader or navigated using a keyboard. The order that content is navigated sequentially is called the "Tab Order" because often the "Tab" key is used to navigate from one "floating" object to the next.
A useful aspect of presentation applications is the facility to add notes to slides, which can then be read by assistive technologies. You can use these slide notes to explain and expand on the contents of your slides in text format. Slide notes can be created as you build your presentation.
When using images or other graphical objects, such as charts and graphs, it is important to ensure that the information you intend to convey by the image is also conveyed to people who cannot see the image. This can be accomplished by adding concise alternative text to of each image. If an image is too complicated to concisely describe in the alternative text alone (artwork, flowcharts, etc.), provide a short text alternative and a longer description as well.
Alternatively, you can include the same information conveyed by the image within the body of the document, providing the images as an alternate to the text. In that case, you do not have to provide alternate text within the image.
When using tables, it is important to ensure that they are clear and appropriately structured. This helps all users to better understand the information in the table and allows assistive technologies (e.g., screen readers) to provide context so that the information within the table can be conveyed in a meaningful way.
When you create lists, it is important to format them as “real lists”. Otherwise, assistive technologies will interpret your list as a series of short separate paragraphs instead of a coherent list of related items.
Use Columns feature for placing text in columns.
Note: Because columns can be a challenge for users of some assistive technologies, consider whether a column layout is really necessary.
In case the document is ever converted into HTML, it should be given a descriptive and meaningful title.
Note: The Title defined in the properties is different than the file name. It is also unrelated to the template name, discussed above.
Charts can be used to make data more understandable for some audiences. However, it is important to ensure that your chart is as accessible as possible to all members of your audience. All basic accessibility considerations that are applied to the rest of your document must also be applied to your charts and the elements within your charts. For example, use shape and color, rather than color alone, to convey information. As well, some further steps should be taken to ensure that the contents are your chart are appropriate labeled to give users reference points that will help them to correctly interpret the information.
When formatting text, especially when the text is likely to be printed, try to:
But can’t users just zoom in? Office applications do typically include accessibility features such as the ability to magnify documents and support for high contrast modes. However, because printing is an important aspect of many workflows and changing font sizes directly will change documents details such the pagination, the layout of tables, etc., it is best practice to always format text for a reasonable degree of accessibility.
The visual presentation of text and images of text should have a contrast ration of at least 4.5:1. To help you determine the contrast, here are some examples on a white background:
Also, always use a single solid color for a text background rather than a pattern.
In order to determine whether the colors in your document have sufficient contrast, you can consult an online contrast checker, such as:
Color should not be used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element. In order to spot where color might be the only visual means of conveying information, you can create a screenshot of the document and then view it with online gray-scale converting tools, such as:
The instructions provided for understanding and operating content should not rely solely on sensory characteristics such as the color or shape of content elements. Here are two examples:
Before you use an image to control the presentation of text (e.g., to ensure a certain font or color combination), consider whether you can achieve the same result by styling “real text”. If this is not possible, as with logos containing stylized text, make sure to provide alternative text for the image following the techniques noted, above.
Transitions between slides and elements in each slide (e.g., bullets in a list flying onto the screen) can be distracting to users with disabilities. It can also cause assistive technologies to read the slide incorrectly. For these reasons, it is best to avoid transitions altogether.
By taking the time to design your content in a consistent way, it will be easier to access, navigate and interpret for all users:
Hyperlinks are more effective navigation aids when the user understands the likely result of following the link. Otherwise, users may have to use trial-and-error to find what they need.
To help the user understand the result of selecting a hyperlink, ensure that the link makes sense when read in the context of the text around it. For example, while it would be confusing to use “more information” as a link by itself on a page, it would be fine to use “more information” as a link in the following sentence: “The airport can be reached by taxi or bus (more information).”
To make the address of hyperlink clear when printing, you may wish to include the address in brackets following the descriptive text of the hyperlink.
It is important to consider accessibility before, during, and after presentations. Below is a helpful link with guidance on how to make presentations accessible to all:
At this time, OpenOffice Impress does not offer a mechanism to identify potential accessibility errors in your document prior to publishing. [Tested: September 20th, 2010]
In order to get some indication of the accessibility of your document or template (see Technique 1), then you may consider saving the file into HTML or PDF in order to perform an accessibility check in one of those formats, as described below.
If you wish to check the accessibility of your document or template (see Technique 1), one option is to save it into HTML format and use one of the web accessibility checkers available online. Such as:
If you saved your document in tagged PDF format, you can use the following tools and steps to evaluate the accessibility of the PDF document:
In some cases, additional steps must be taken in order to ensure accessibility information is preserved when saving/exporting to formats other than the default.
PDF documents are not always accessible. Accessible PDF documents are often called “Tagged PDF” because they include “tags” that encode structural information required for accessibility. To evaluate the accessibility of your PDF document, see Technique 11.
Note: You must ensure this option is selected in the PDF Options window dialog box before using PDF icon on menu bar.
Disclaimer: This list is provided for information purposes only. It is not exhaustive and inclusion of an application or plug-in on the list does not constitute a recommendation or guarantee of results.
The following accessibility related plug-ins and support are available for OpenOffice Impress:
If you are interested in what features are provided to make using OpenOffice Impress more accessible to users, documentation is provided in the Help system:
This document was produced as part of the Accessible Digital Office Document (ADOD) Project (http://inclusivedesign.ca/accessible-office-documents).
This project has been developed by the Inclusive Design Research Centre, OCAD University as part of an EnAbling Change Partnership project with the Government of Ontario and UNESCO (United Nations Educational, Scientific and Cultural Organization).
Accessible Digital Office Documents (ADOD) Project by Inclusive Design Research Centre (IDRC) is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.