PL-300 Visualize and analyze the data Practice Question
Which THREE of the following are best practices for designing Power BI reports for accessibility? (Select three.)
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
✓
Ensure tab order is logical for keyboard navigation.
Option B is correct because a logical tab order lets keyboard and screen-reader users move through report elements in a meaningful sequence, which is a core accessibility requirement in Power BI. Option C is correct because high color contrast between text and background ensures content remains legible for users with low vision or color-vision deficiencies, aligning with WCAG contrast guidance. Option E is correct because alt text gives screen readers a textual description of visuals, charts, and images so non-visual users can understand the data being presented. Option A is not appropriate because 3D effects reduce clarity and can distort data perception rather than improve accessibility. Option D is not appropriate because using as many colors as possible harms differentiation for color-blind users and creates visual clutter; accessible designs use a limited, distinguishable palette.
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 3D effects to make visuals more engaging.
Why it's wrong here
3D effects can cause accessibility issues and distort data perception, making it difficult to read exact values and compare categories accurately. In Power BI, 3D perspective changes how bars and pie slices appear, which can misrepresent proportions and create unnecessary visual noise. Best practice is to use flat 2D visuals with clear labels and data points, ensuring all users see accurate information.
- ✓
Ensure tab order is logical for keyboard navigation.
Why this is correct
Ensuring a logical tab order is a core accessibility best practice for keyboard-only and screen reader users. In Power BI, you can define tab order in the Selection pane to match the natural reading flow of the report, so keyboard users can navigate from title to slicers to visuals in a meaningful sequence. This prevents unpredictable jumps and makes the report usable for people with motor impairments who rely on keyboard navigation.
- ✓
Use high color contrast between text and background.
Why this is correct
Using high color contrast between text and background improves readability for users with low vision and ensures legibility on monitors, projectors, and mobile devices. Power BI themes should meet WCAG 2.1 AA standards, with a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. Additionally, avoid conveying meaning through color alone, because contrast requirements work together with other cues like shape and text to make data accessible.
- ✗
Use as many colors as possible to differentiate data.
Why it's wrong here
Using as many colors as possible to differentiate data creates cognitive overload and fails for color-blind users, especially with categorically similar hues. Inconsistent or excessive color also distracts from data and creates confusion about which data points are related. Best practice is to use a small, colorblind-safe palette, and rely on labels, shape, size, or position to carry redundant meaning so that the report remains interpretable even in grayscale.
- ✓
Provide alt text for all visual elements.
Why this is correct
Providing alt text for all visual elements ensures that screen reader users can understand the content and key insights of charts, slicers, and images. Alt text should describe the visual’s purpose and message—for example, 'Total sales by region, with North America leading'—rather than simply naming the chart type. In Power BI, you add alt text to each visual, and complex visuals may require a supplementary text summary or table for full accessibility.
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