package.json里對bootstrap的引用：

The .btn classes are designed to be used with the element. However, you can also use these classes on or elements (though some browsers may apply a slightly different rendering).
When using button classes on elements that are used to trigger in-page functionality (like collapsing content), rather than linking to new pages or sections within the current page, these links should be given a role=“button” to appropriately convey their purpose to assistive technologies such as screen readers.

<a class="btn btn-primary" href="#" role="button">Link</a> <button class="btn btn-primary" type="submit">Button</button> <input class="btn btn-primary" type="button" value="Input"> <input class="btn btn-primary" type="submit" value="Submit"> <input class="btn btn-primary" type="reset" value="Reset">

btn-sm和btn-lg分別代表不同尺寸的button.

https://thesassway.com/understanding-placeholder-selectors/

更多Jerry的原創文章，盡在：“汪子熙”:

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