By default, SVG content with a viewBox is scaled to maintain the aspect ratio, and if the aspect ratios of the sides of the viewport and viewbox do not match, margins will appear around the content:
The preserveAspectRatio property can be used to change this behavior: for example, the value none indicates that the aspect ratio should not be preserved:
<svg viewBox="0 0 237 300" preserveAspectRatio="none">
…
</svg>
In this case, the area whose dimensions are set by the viewbox is stretched to fit the entire available viewport space:
preserveAspectRatio is set only using an attribute.
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SVG Width and Height</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/viewbox-attribute">2. The viewBox Attribute</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/viewbox-dimensions">3. viewBox and Dimensions</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/challenge-1">4. Challenge: Fish</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/svg-basics/svg-dimensions/preserveaspectratio-attribute">5. The preserveAspectRatio Attribute</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/flexible-background">6. Flexible Background with preserveAspectRatio</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/challenge-2">7. Challenge: Flexible Margins</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/preserveaspectratio-alignment">8. Alignment in preserveAspectRatio</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/preserveaspectratio-viewbox">9. preserveAspectRatio and viewBox</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/filling-space">10. Filling the Space</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/challenge-3">11. Challenge: Rainbow</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/units">12. Units</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/coordinate-systems">13. Coordinate systems</a></li><li class="main-nav__course-contents-item"><a href="/courses/svg-basics/svg-dimensions/coordinate-transforms">14. 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2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 2.79-6.835-.084.354 2.613.43 4.138-1.208 1.078-1.125.446-2-.186-3.375-1.71-3.552-4.585-6.323-7.384-8.918-.716-.69-1.44-2.428-2.706-2-.995.353-.93 3.2-.716 4.073 1.09 7.448 4.065 18.263 4.065 18.263zm37.372-.78c-1.704-1.826-2.822-4.12-3.208-6.585 0 .354-2.614.354-4.056-1.29-.995-1.127-.362-1.86.363-3.117 1.86-3.198 4.863-5.718 7.746-8.136.81-.604 1.627-1.47 2.79-.93.994.428.715 2.334.548 3.115-1.083 5.72-2.48 11.376-4.183 16.943z" fill="#FFF"/><path d="M53.564 20.422c-1.98.51-4.138 1.636-5.105 3.487-.43-2.196 1.645-4.65 3.393-5.832.333-.21.312-.703-.037-.886-.162-.085-.357-.076-.512.022-2.157 1.562-4.417 4.5-3.784 7.188.076.262.354.41.614.325l-.075.28c-.085.603.93.864.994.26.446-2.158 2.706-3.376 4.77-3.897.372-.076.522-.526.27-.81-.133-.15-.342-.204-.53-.138zM17.457 18.06c-.55-.354-.995.428-.55.865 1.433 1.004 3.182 3.05 3.395 4.956-.93-1.86-3.05-2.975-5.105-3.486-.386-.005-.633.41-.445.747.042.076.103.14.176.184 2.073.52 4.324 1.73 4.77 3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><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 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">The preserveAspectRatio Attribute</h1><div class="course-theory__content-text"><p>By default, SVG content with a <code>viewBox</code> is scaled to maintain the aspect ratio, and if the aspect ratios of the sides of the viewport and viewbox do not match, margins will appear around the content:</p><svg viewBox="0 0 237 300" width="350" height="150" style="border: 2px solid teal"><g fill="none" fill-rule="evenodd"><rect width="100%" height="100%" stroke="gray"/><path fill="#EFE77F" fill-rule="nonzero" stroke="#D0011B" stroke-width="5" d="M80.3 87c-47.6 0-82 41.7-76.8 93.2 5.2 51.4 41.6 93 81.4 93 11 0 22-3.6 32-10 10 6.4 21 10 32.5 10 39.7 0 77-41.6 83.3-93 6.3-51.5-27-93.2-75-93.2-14 0-27.4 3.7-39 10.2C107 90.5 93.6 87 80 87z"/><path stroke="#CCCC61" stroke-width="2" d="M101 137.7c-22.2 0-38.2 19.4-35.8 43.4 2.4 24 19.4 44 38 44 5.4 0 10.5-1.5 15-4.5 4.7 3 9.8 4.7 15.3 4.7 18.5 0 36-19.4 38.8-43.3 3-24-12.7-43.4-35-43.4-6.5 0-12.7 1.7-18.2 4.8-5-3-11-4.6-18-4.6z"/><path fill="#6D2323" fill-rule="nonzero" d="M119.8 97.3L78.6 21.8l18.7-8.2"/><path fill="#000" fill-rule="nonzero" d="M116.4 265.8l-6.3 28.6-7-2.5 14-27zm3.4 1l7 28.6 7-6-14-22.6zm-2-3.6l-4 35.6 10.4.3-6.4-35z"/><path fill="#7ED321" fill-rule="nonzero" d="M118.4 94.7s36-6 57.7-32C198 36.7 198 0 198 0s-36 6-58 32-21.6 62.5-21.6 62.5z"/><path fill="#322A09" fill-rule="nonzero" d="M93.2 200c5.6 2.4 11.8 0 16.3-11.2 4.5-11 0-29 0-29s-15.6 9.7-20 21c-4.6 11-1.8 17 3.7 19.3zm53 0c-5.6 2.4-11.8 0-16.3-11.2-5-11 0-29 0-29s15 9.7 20 21c4 11 1 17-4 19.3z"/><path stroke="#B8E986" d="M119.8 95c50.4-67 43.5-37.2 76-94.5" stroke-linecap="square"/></g></svg><p>The <code>preserveAspectRatio</code> property can be used to change this behavior: for example, the value <code>none</code> indicates that the aspect ratio should not be preserved:</p><pre><code><svg viewBox="0 0 237 300" preserveAspectRatio="none">
…
</svg></code></pre><p>In this case, the area whose dimensions are set by the viewbox is stretched to fit the entire available viewport space:</p><svg viewBox="0 0 237 300" preserveAspectRatio="none" width="350" height="150" style="border: 2px solid teal"><g fill="none" fill-rule="evenodd"><rect width="100%" height="100%" stroke="gray"/><path fill="#EFE77F" fill-rule="nonzero" stroke="#D0011B" stroke-width="5" d="M80.3 87c-47.6 0-82 41.7-76.8 93.2 5.2 51.4 41.6 93 81.4 93 11 0 22-3.6 32-10 10 6.4 21 10 32.5 10 39.7 0 77-41.6 83.3-93 6.3-51.5-27-93.2-75-93.2-14 0-27.4 3.7-39 10.2C107 90.5 93.6 87 80 87z"/><path stroke="#CCCC61" stroke-width="2" d="M101 137.7c-22.2 0-38.2 19.4-35.8 43.4 2.4 24 19.4 44 38 44 5.4 0 10.5-1.5 15-4.5 4.7 3 9.8 4.7 15.3 4.7 18.5 0 36-19.4 38.8-43.3 3-24-12.7-43.4-35-43.4-6.5 0-12.7 1.7-18.2 4.8-5-3-11-4.6-18-4.6z"/><path fill="#6D2323" fill-rule="nonzero" d="M119.8 97.3L78.6 21.8l18.7-8.2"/><path fill="#000" fill-rule="nonzero" d="M116.4 265.8l-6.3 28.6-7-2.5 14-27zm3.4 1l7 28.6 7-6-14-22.6zm-2-3.6l-4 35.6 10.4.3-6.4-35z"/><path fill="#7ED321" fill-rule="nonzero" d="M118.4 94.7s36-6 57.7-32C198 36.7 198 0 198 0s-36 6-58 32-21.6 62.5-21.6 62.5z"/><path fill="#322A09" fill-rule="nonzero" d="M93.2 200c5.6 2.4 11.8 0 16.3-11.2 4.5-11 0-29 0-29s-15.6 9.7-20 21c-4.6 11-1.8 17 3.7 19.3zm53 0c-5.6 2.4-11.8 0-16.3-11.2-5-11 0-29 0-29s15 9.7 20 21c4 11 1 17-4 19.3z"/><path stroke="#B8E986" d="M119.8 95c50.4-67 43.5-37.2 76-94.5" stroke-linecap="square"/></g></svg><p><code>preserveAspectRatio</code> is set only using an attribute.</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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