Responsive Images — Complete Guide
Responsive Images — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of HTML Tutorial on Toolliyo Academy.
On this page
HTML Tutorial · Lesson 17 of 100
Responsive Images
Basics → Forms & semantics → APIs & performance → Projects
Basics · 1 — Structure & media · ~6 min · HTML — Media & Content
What is this?
srcset and sizes (and picture) let the browser pick an image resolution that fits the viewport.
Why should you care?
MarkupVerse product images ship 1x/2x to save mobile bandwidth.
See it live — copy this example
Save as demo.html and open in your browser, or use Run Example below.
<img
src="/img/hero-800.jpg"
srcset="/img/hero-400.jpg 400w, /img/hero-800.jpg 800w, /img/hero-1200.jpg 1200w"
sizes="(max-width: 600px) 100vw, 600px"
alt="MarkupVerse dashboard on a laptop"
width="600"
height="380">Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- sizes must match CSS layout.
- picture + source for art direction (crop), not only resolution.
Practice next
- Add srcset with 3 widths.
- Write sizes.
- Check Network tab on mobile width.
- Wrap in picture with webp source.
- Add loading="lazy".
Remember
srcset + sizes. Match layout. picture for art direction.
MarkupVerse hero srcset
Landing loads smaller image on phones.
Outcome: Faster LCP on mobile.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!
