PL-300 Alt text Practice Question
Which TWO actions are best practices for designing accessible Power BI reports? (Choose two.)
⚠ Common exam trap
A common trap is to confuse adding alt text to all images (including decorative ones) as accessibility best practice, but decorative images should be marked as decorative to avoid unnecessary noise for screen readers.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Provide descriptive alt text for all visuals
Option B is correct because providing descriptive alt text for all visuals lets screen-reader users understand the meaning and content of each chart, table, or image, which is a core accessibility requirement in Power BI. Option E is correct because every visual should have a clear, meaningful title so users of assistive technology and all readers can identify what the visual represents without relying on color or position alone. Option A is incorrect because a complex tab order makes keyboard navigation harder; accessible reports should use a logical, simple tab order. Option C is incorrect because using only high-contrast colors is not sufficient and can itself create issues; color should not be the sole means of conveying information, and sufficient contrast should be combined with other cues. Option D is incorrect because decorative images should generally be marked as decorative or have empty alt text, not given descriptive alt text, to avoid unnecessary screen-reader noise.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use complex tab order to navigate quickly
Why it's wrong here
A complex tab order—however deliberate—forces keyboard-only users and screen readers through a non-linear path, making focus unpredictable and increasing cognitive load. In Power BI, accessibility best practice is a logical tab order that follows the visual reading sequence; shortcuts and 'quick navigation' patterns undermine this.
- ✓
Provide descriptive alt text for all visuals
Why this is correct
Descriptive alt text must explain what a visual shows—its trend, key takeaway, or data story—rather than simply naming the object. For non-decorative visuals, screen readers rely on this text as an equally effective alternative, so include the insight a sighted user would derive from the chart.
- ✗
Use only high-contrast colors
Why it's wrong here
Insisting on only high-contrast colors is too blunt: maximum contrast can cause glare and readability issues, while color alone cannot support users with color blindness. The correct standard is sufficient contrast (WCAG 4.5:1 for normal text) combined with labels, shapes, and patterns, not an exclusive palette.
- ✗
Add alt text to every image, including decorative ones
Why it's wrong here
Adding alt text to every image including decorative ones adds screen reader noise; decorative images should be marked as decorative (or given empty alt text) so assistive technology skips them. Only informative images need descriptive alt text—with alt="" for purely visual elements—so this blanket approach is not a best practice.
- ✓
Ensure all visuals have a clear title
Why this is correct
A clear, meaningful title gives every visual a necessary anchor for understanding, and screen readers announce it as part of the accessibility tree. Power BI titles should describe the visual's purpose and takeaway, not just 'Sales' or 'Chart 1', helping all users—especially those with cognitive disabilities—orient quickly.
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