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POIn CSS, how to avoid accidentally getting a style from other classes, especially for widgets?
 

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  1. POIn CSS, how to avoid accidentally getting a style from other classes, especially for widgets?
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    <p>When we write our widgets using HTML, JavaScript, and CSS and package the widgets together as a library, we may have</p> <pre><code>.foobarwidget-sidebar-section .sub-section { border: 1px solid #000 } </code></pre> <p>so we will implement the JavaScript to work with the behavior of this widget that we defined, that can be used in any page on our website or by other people.</p> <p>But then, if there is a user of this widget, and he has HTML in his own webpage for a "sub-section":</p> <pre><code>.sub-section { color: green } </code></pre> <p>Then pretty much his <code>.sub-section</code> will add to our widget's CSS style.</p> <p>It is true that he can use</p> <pre><code>#the-main-content .sub-section { color: green } </code></pre> <p>or</p> <pre><code>.a-main-content-box .sub-section { color: green } </code></pre> <p>so that it doesn't affect our widget, but what if his design is that the <code>#main-content</code> box <strong>contains</strong> our <code>sidebar</code> widget (or a search box widget, or a social link button widget)? In that case, his <code>.sub-section</code> will again affect our CSS for the widget.</p> <p>Of course, we can define all the possible CSS styles for our widget, such as</p> <pre><code>.foobarwidget-sidebar-section .sub-section { color: blue !important; font-weight: bold !important; /* ... and all possible CSS styles ... */ } </code></pre> <p>but that doesn't look like a good feasible solution. We also might use</p> <pre><code>.foobarwidget-sidebar-section &gt; .sub-section { ... } </code></pre> <p>so that the <code>.sub-section</code> must be the immediate child, but it doesn't affect a standalone <code>.sub-section</code> affect our widget's CSS. In such situation, what is a good solution to handle it?</p>
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