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What Is Mobile-First Design?",[],{"id":385,"text":386,"level":57,"children":387},"2-the-viewport-meta-tag","2. The Viewport Meta Tag",[],{"id":389,"text":390,"level":57,"children":391},"3-fluid-layouts","3. Fluid Layouts",[],{"id":393,"text":394,"level":57,"children":395},"4-media-queries-mobile-first-style","4. Media Queries (Mobile-First Style)",[],{"id":397,"text":398,"level":57,"children":399},"5-responsive-images","5. Responsive Images",[],{"id":401,"text":402,"level":57,"children":403},"6-css-grid-flexbox-for-responsiveness","6. CSS Grid & Flexbox for Responsiveness",[],{"id":405,"text":406,"level":57,"children":407},"7-testing-responsiveness","7. Testing Responsiveness",[],[409,412,414],{"id":329,"language":16,"code":410,"is_editable":411},"\u003C!DOCTYPE html>\n\u003Chtml>\n\u003Chead>\n  \u003Cmeta charset=\"UTF-8\">\n  \u003Cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n  \u003Ctitle>Mobile-First Demo\u003C\u002Ftitle>\n\u003C\u002Fhead>\n\u003Cbody>\n  \u003Cdiv class=\"container\">\n    \u003Cdiv class=\"card\">Card 1\u003C\u002Fdiv>\n    \u003Cdiv class=\"card\">Card 2\u003C\u002Fdiv>\n    \u003Cdiv class=\"card\">Card 3\u003C\u002Fdiv>\n  \u003C\u002Fdiv>\n\u003C\u002Fbody>\n\u003C\u002Fhtml>",true,{"id":333,"language":10,"code":413,"is_editable":411},"\u002F* Mobile-first base styles (default = mobile) *\u002F\n.container {\n  display: flex;\n  flex-direction: column;\n  gap: 12px;\n  padding: 16px;\n}\n\n.card {\n  background: #3498db;\n  color: white;\n  padding: 20px;\n  border-radius: 8px;\n  text-align: center;\n}\n\n\u002F* Tablet and up *\u002F\n@media (min-width: 768px) {\n  .container {\n    flex-direction: row;\n  }\n}\n\n\u002F* Desktop and up *\u002F\n@media (min-width: 1024px) {\n  .container {\n    max-width: 1200px;\n    margin: 0 auto;\n  }\n  .card {\n    padding: 32px;\n  }\n}",{"id":337,"language":16,"code":415,"is_editable":411},"\u003Cimg \n  src=\"photo-small.jpg\" \n  srcset=\"photo-small.jpg 480w, photo-medium.jpg 800w, photo-large.jpg 1200w\" \n  sizes=\"(max-width: 600px) 480px, (max-width: 900px) 800px, 1200px\" \n  alt=\"Responsive example photo\" \n  style=\"max-width:100%; height:auto;\">",{"id":117,"slug":417,"title":418,"time_limit_seconds":5,"pass_percentage":329,"question_count":23},"responsive-html-design-quiz","Responsive HTML Design Quiz",[420],{"id":165,"title":421,"slug":422,"prompt":423,"starter_code":424,"expected_output":425,"language":10,"order_index":23},"Convert Desktop-First CSS to Mobile-First","convert-desktop-first-to-mobile-first","The CSS below is written desktop-first (using max-width queries). Rewrite it in mobile-first style: base styles for mobile, then use min-width media queries to scale up for tablet (768px) and desktop (1024px).","\u002F* Desktop-first (needs conversion) *\u002F\n.container {\n  display: flex;\n  flex-direction: row;\n  max-width: 1200px;\n  margin: 0 auto;\n}\n\n@media (max-width: 1023px) {\n  .container { max-width: 100%; }\n}\n\n@media (max-width: 767px) {\n  .container { flex-direction: column; }\n}","CSS rewritten with base (mobile) styles first and min-width media queries for 768px and 1024px breakpoints.","2026-09-27T17:31:58+00:00",{"id":169,"slug":171,"title":170},{"id":177,"slug":179,"title":178}]