SALESFORCE-PD1 User Interface Practice Question
Which THREE statements are true regarding Lightning Web Component shadow DOM encapsulation? Choose 3 answers.
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
✓
querySelector calls inside a component only search within that component's template unless using specific host selectors.
Shadow DOM encapsulates templates, styles, and queries, preventing external CSS bleeding and restricting queries to the component template.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Global CSS stylesheets automatically penetrate and override LWC shadow DOM styles.
Why it's wrong here
Global CSS does not pierce shadow DOM encapsulation.
- ✗
Child components can be styled directly from parent CSS files without styling hooks.
Why it's wrong here
Shadow boundaries prevent direct external CSS styling.
- ✓
querySelector calls inside a component only search within that component's template unless using specific host selectors.
Why this is correct
DOM queries are encapsulated within the component shadow root.
- ✓
Styles defined in a component's stylesheet only apply to that component.
Why this is correct
CSS is scoped to the component's shadow tree.
- ✓
HTML templates are rendered inside a shadow root for the component.
Why this is correct
LWC uses native shadow DOM for encapsulation.
About these practice questions
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Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
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