We didn‘t mention the margin property in the previous assignment, because it comes with a number of surprises:
-
Margins do not collapse either horizontally or vertically.
-
Margins do not overflow either the flex container or flex items.
-
The auto value received the Forbes magazine award in the category “The Most Influential Value for a CSS Property Inside a Flex Container”.
It all has to do with the mechanism that is used to allocate free space. If there is free space inside a flex container, then it is redistributed as follows:
-
There are items with margins that have been assigned the value auto;
-
All of the free space in the corresponding directions is allocated to these margins (in other words, a certain margin size is set in pixels).
-
If there are several items with automatic margins set in one direction, then the space between them is redistributed equally.
-
It is only once these items are spaced properly that the alignment mechanisms are allowed to act on them.
Therefore, margin: auto; affects the positioning of flex items on both axes, and is also supersedes alignment mechanisms, because alignment occurs when there is free space. But if all of the free space overflows into the automatic margin, then there is nothing to align.
These features can be used to good effect. For example, you can control the arrangement of the items along the main axis using automatic margins. Let’s experiment.
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Flex items and the block model</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/layout/flexbox-2/margin-features">2. Features of the margin property</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/alignment-margins">3. Alignment and margins</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/main-axis-margins">4. The flow direction of the main axis and margins</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/flex-basis">5. The initial main size of flex item, flex-basis</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/cubism">6. Test: Cubism</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/flex-grow">7. The item growth factor, flex-grow</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/growing-proportionally">8. 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Test: Mastering factors</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/flex-shorthand">15. The flex shorthand property</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/multi-line-flex-shrink">16. Multi-line flex containers and flex-shrink</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/multi-line-flex-grow">17. Multi-line flex containers and flex-grow</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/flex-basis-flex-wrap">18. flex-basis: 100% and flex-wrap</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/heading-flexbox">19. The heading with description in flexboxes</a></li><li class="main-nav__course-contents-item"><a href="/courses/layout/flexbox-2/heading-description">20. 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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">Features of the margin property</h1><div class="course-theory__content-text"><p>We didn‘t mention the <code>margin</code> property in the <a href="flex-items">previous assignment</a>, because it comes with a number of surprises:</p><ul><li><p>Margins do not collapse either horizontally or vertically.</p></li><li><p>Margins do not overflow either the flex container or flex items.</p></li ><li><p>The <code>auto</code> value received the Forbes magazine award in the category “The Most Influential Value for a CSS Property Inside a Flex Container”.</p></li></ul><p>It all has to do with the mechanism that is used to allocate free space. If there is free space inside a flex container, then it is redistributed as follows:</p><ol><li><p>There are items with margins that have been assigned the value <code>auto</code>;</p></li><li><p>All of the free space in the corresponding directions is allocated to these margins (in other words, a certain margin size is set in pixels).</p></li><li><p>If there are several items with automatic margins set in one direction, then the space between them is redistributed equally.</p></li><li><p>It is only once these items are spaced properly that the alignment mechanisms are allowed to act on them.</p></li></ol><p>Therefore, <code>margin: auto;</code> affects the positioning of flex items on both axes, and is also supersedes <a href="/courses/layout/flexbox-1/justify-content">alignment mechanisms</a>, because alignment occurs when there is free space. But if all of the free space overflows into the automatic margin, then there is nothing to align.</p><p>These features can be used to good effect. For example, you can control the arrangement of the items along the main axis using automatic margins. Let’s experiment.</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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