html表格边框加粗

要在HTML表格中加粗边框，可以使用border属性来设置边框的样式和宽度。引用和引用中的示例代码都展示了如何使用border属性来设置表格的边框样式。在示例代码中，border="1"表示边框宽度为1个单位。你可以根据需要调整该值以增加或减少边框的粗细。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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