能否不使用position属性创建网站？侧边栏布局问题求助

Absolutely! You don’t need to rely on the position property at all to build fully functional, well-structured websites—including layouts with dual sidebars. Let’s break down the most reliable modern alternatives tailored to your scenario:

CSS Grid is the gold standard for creating complex layouts like dual sidebars. It lets you define explicit rows and columns, so you can place your sidebars and main content exactly where you want without fighting with position.

Here’s a quick example for a dual-sidebar layout:

.page-container {
  display: grid;
  grid-template-columns: 200px 1fr 200px; /* Left sidebar, main content, right sidebar */
  gap: 2rem; /* Adds space between each section */
}

.left-sidebar {
  /* No position required—Grid handles placement automatically */
}

.main-content {
  grid-column: 2; /* Targets the second column for main content */
}

.right-sidebar {
  grid-column: 3; /* Targets the third column for the right sidebar */
}

This setup keeps all elements in the normal document flow, avoids overlapping issues, and is super responsive. For mobile, just adjust grid-template-columns to 1fr to stack all sections vertically.

If you prefer a more flexible, one-dimensional approach, Flexbox is another excellent option. It’s perfect for aligning elements in a row (or column) and controlling how space is distributed between them.

Example for dual sidebars with Flexbox:

.page-container {
  display: flex;
  gap: 2rem;
}

.left-sidebar, .right-sidebar {
  flex: 0 0 200px; /* Fixes the sidebar width so they don't shrink/grow */
}

.main-content {
  flex: 1; /* Makes main content take up all remaining space */
}

For mobile responsiveness, simply add a media query that sets flex-direction: column on the container—this will stack all sections vertically without any extra work.

If you need to support older browsers (though this is less common these days), floats can get the job done. Just remember to clear the float afterward to prevent layout glitches.

Example with floats:

.left-sidebar {
  float: left;
  width: 200px;
  margin-right: 2rem;
}

.right-sidebar {
  float: right;
  width: 200px;
  margin-left: 2rem;
}

.main-content {
  overflow: hidden; /* Clears the floats, ensuring main content takes remaining space */
}

Note: Floats can be trickier to work with for responsive design and may require more workarounds, so Grid or Flexbox are better modern choices.

I’m glad you found that tutorial helpful—modern layout tools like Grid and Flexbox are designed to eliminate the headaches that come with overusing position, like broken document flow, overlapping elements, and responsive design struggles.

内容的提问来源于stack exchange，提问作者Ikkaom