MICRO-COURSE

How Browsers Work

How Browsers Work: 14 short lessons, one for each concept. Parsing HTML, the DOM, the CSSOM, the render tree, layout, paint, compositing, the JavaScript engine, the browser event loop, the request lifecycle, browser caching, the same-origin policy, browser storage, and service workers.

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01 / WATCH

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02 / UNDERSTAND

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Parsing HTML, the DOM, the CSSOM, the render tree, layout, paint, compositing, the JavaScript engine, the browser event loop, the request lifecycle, browser caching, the same-origin policy, browser storage, and service workers.

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03 / TRY IT

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Choose one question about How Browsers Work that you want to answer.
Write down a small example, its inputs or starting point, and the result you expect.
Explain your reasoning and note what you would like reviewed in a live or 1:1 session.

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Explain the concept in your own words and identify where it fits in the subject.
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Record one limitation or edge case and a question to discuss with a mentor.

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Explore 14 focused topics.

Each topic opens its own micro-course, with its learning guide, recording status and session requests.

14 results1–12

Lesson

Parsing HTML

A short lesson on parsing HTML from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

The DOM

A short lesson on the DOM from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

The CSSOM

A short lesson on the CSSOM from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

The render tree

A short lesson on the render tree from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

Layout

A short lesson on layout from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

Paint

A short lesson on paint from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

Compositing

A short lesson on compositing from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

The JavaScript engine

A short lesson on the JavaScript engine from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

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Lesson

The browser event loop

A short lesson on the browser event loop from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

Open lesson

Lesson

The request lifecycle

A short lesson on the request lifecycle from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

Open lesson

Lesson

Browser caching

A short lesson on browser caching from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

Open lesson

Lesson

The same-origin policy

A short lesson on the same-origin policy from the How Browsers Work micro course: what it is, where it shows up in real systems, and a practical example you can apply.

Open lesson

How Browsers Work

Recorded video

Start with the topic guide.

Concept scope

Prepare a focused example

Check your understanding

Need a walkthrough?Stay with this topic.

Request a live session for this topic.

Explore 14 focused topics.

Parsing HTML

The DOM

The CSSOM

The render tree

Layout

Paint

Compositing

The JavaScript engine

The browser event loop

The request lifecycle

Browser caching

The same-origin policy

Need a walkthrough?
Stay with this topic.