Question: Select all that apply. Which of the following can negatively impact your CLS score?
- Images and iframes without inline dimensions
- Large items like YouTube video embeds or image sliders
- Dynamically injected content
- Improperly loaded custom webfonts
Explanation
Elements that shift unexpectedly during page load, such as images and iframes without inline dimensions, cause Cumulative Layout Shift (CLS). Dynamically injected content can move existing elements, and improperly loaded custom webfonts can change text size or layout after rendering. Minimizing these issues improves visual stability, enhances user experience, and supports Page Experience signals for SEO.
Why the other options are incorrect
B) Large items like YouTube embeds or sliders do not automatically cause CLS if their dimensions are defined and they load predictably.
Source for verification
HubSpot Academy: Core Web Vitals and Page Experience
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