Service worker

Code pattern Key terms bank

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Definition

A background script in a PWA that caches files and intercepts network requests so the app works offline.

Example: Cache the app shell so it loads without internet.

Found in: sample exam and familiarisation guidelines, school notes.

Short version to memorise (key terms bank)

Background script that caches and intercepts requests.

Where you'll use it in the test

Syllabus area: Y12 Programming for the Web.

Question types it can appear in

Multiple choice: Pick the option that matches the definition or example.
Short answer: Define, outline or explain it and tie it to the scenario.

Where it has appeared in the paper

Programming for the Web (Part A). Part letters follow each paper’s own layout.

How to use it

A model sentence

General advice, built from the definition and example above

Code pattern: “A background script in a PWA that caches files and intercepts network requests so the app works offline.” Then apply it: Cache the app shell so it loads without internet.

In a short answer, give the definition in your own words first, then tie it to the situation in the question. Do not copy the example above unless it fits the scenario.

Command words used with it

From the linked past questions

Compare: Show how things are similar or different. (2025 HSC Q16a (3 marks): Progressive web apps)

Official worked answer

2025 HSC Q16a (3 marks): Progressive web apps (3 marks): official criteria and sample answer

Criteria

3: Compares the use of a PWA with an interactive website for the weather app. 2: Outlines features of a PWA and/or interactive website. 1: Identifies a feature of a PWA or an interactive website.

Sample answer

Both PWAs and interactive websites are platform-independent, allowing users to access the app on any device with a browser. PWAs can pre-cache updates to enable offline updates when a stable internet connection is not available but may not provide real time updates for the most recent changes to weather or warnings. Meanwhile, interactive websites require a constant internet connection to provide any updates.

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Go deeper

Flashcard: Service worker in Programming for the Web (Year 12) · study that set
Memorise: SQL vs ORM
Key terms bank entry: Service worker
Notes: Design, develop and implement a progressive web app (PWA), including the application of… (Programming for the Web (Year 12))
Notes: Applications of web programming: interactive websites, e-commerce, PWAs (Programming for the Web (Year 12))
Notes: Browser influence and developer tools (Programming for the Web (Year 12))
Full term page: every question, note and marking comment for Service worker

Check yourself

Write or say the “Service worker” pattern from memory: the syntax and what it does.

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