In this series of exercises, we will examine an interesting trick related to the good old border property. You can use regular frames to create extraordinary effects!
Frames have one peculiar feature: if the frame of an element is wide, and the element itself has zero width and height, then the borders of the frame will be triangular.
Let’s try it out in practice!
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</script><link rel="stylesheet" href="https://assets.htmlacademy.org/css/core.v284.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/profile.v236.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course.v246.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-light.v20.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-en.v2.css"><script src="https://assets.htmlacademy.org/js/sentry.js" data-sentry="3774884cc81746ed84c0ba7c5cd4ac7b" data-project="26" data-version="2"></script><link rel="stylesheet" href="/css/custom.css"><link rel="stylesheet" href="/css/cookies.css"><link rel="preload" as="script" href="https://assets.htmlacademy.org/js/general.v274.js"><title>Frames and Triangles, Part 1 — Frames and Backgrounds — HTML Academy</title><meta name="csrf-token" content="83964caf322823086fca37a7326b9bd2a54"><meta property="og:type" content="website"><meta property="og:site_name" content="HTML Academy"><meta name="twitter:url" property="og:url" content="https://htmlacademy.org"><meta name="twitter:title" property="og:title" content="Interactive online courses HTML Academy"><meta name="twitter:description" property="og:description" content="Together we’ll learn how to work with real code, solve true-to-life problems, use cutting edge technologies. 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Preparation</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-size-1">2. Background Size, Step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-size-2">3. Background Size, Step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-borders">4. Background Borders</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-cropping">5. Background Cropping</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/multiple-background-images">6. Multiple Background Images</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-position">7. Positioning the background relative to different borders</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-repeat-round">8. background-repeat: round</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/background-repeat-space">9. background-repeat: space</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/outer-frame">10. Outer Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/rounding-corners-1">11. Rounding Corners, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/rounding-corners-2">12. Rounding Corners, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-source">13. Frame Image: border-image-source</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-slice">14. Frame Image: border-image-slice</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/slicing-asymmetrical-images">15. Slicing Asymmetrical Images</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-repeat-1">16. Frame Image: border-image-repeat, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-repeat-2">17. Frame Image: border-image-repeat, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-width">18. Frame Image: border-image-width</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/border-image-outset">19. Frame Image: border-image-outset</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/royal-frame">20. Muffin’s Royal Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/eco-frame">21. Muffin’s Eco-Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-frame-1">22. Muffin’s Round Frame, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-frame-2">23. Muffin’s Round Frame, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/challenge-1">24. Challenge: The Sea Wolf</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/advanced-styling/frames-and-backgrounds/frames-triangles-1">25. Frames and Triangles, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/frames-triangles-2">26. Frames and Triangles, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/frames-triangles-3">27. Frames and Triangles, Part 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/arrow-frame">28. Creating an Arrow with a Frame</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-arrow-frame-1">29. Creating a Round Arrow with a Frame, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/round-arrow-frame-2">30. Creating a Round Arrow with a Frame, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/real-life-triangles-1">31. Real-Life Triangles, Part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/real-life-triangles-2">32. Real-Life Triangles, Part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/advanced-styling/frames-and-backgrounds/challenge-2">33. 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course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Frames and Triangles, Part 1</h1><div class="course-theory__content-text"><p>In this series of exercises, we will examine an interesting trick related to the good old <code>border</code> property. You can use regular frames to create extraordinary effects!</p><p>Frames have one peculiar feature: if the frame of an element is wide, and the element itself has zero width and height, then the borders of the frame will be triangular.</p><p>Let’s try it out in practice!</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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