我试图在文本区域顶部重叠一个 pre 标签，但它只是漂浮在其容器的中间

我花了一些时间试图在文本方面重叠一个预先标签，我正在尝试构建某种文本编辑器。但是，某种程度上，预先标签并未在其容器左上方呈现，而是在中间呈现。没有保证金或填充物将其拉下来，所以我没有想法。还有另一件奇怪的事情正在发生，Textarea具有位置：绝对，但是它的容器仍在延伸到Textarea的高度。

出于挫败感，我从此库中复制了确切的代码：http：//satya164.xyz/reeact-simple-code-editor/。但是，即使它是完全相同的代码，它仍然不起作用。

我的当前代码：

const codeEditor = document.getElementById("code-editor__textarea");
const codeRenderer = document.getElementById("code-editor__pre");
codeEditor.addEventListener("keyup", e => {
  codeRenderer.innerHTML = codeEditor.value;
});

*,
:after,
:before {
  box-sizing: inherit;
}
body {
  font-family: monospace;
  line-height: 1.5;
  margin: 0;
}
.code-editor {
  margin: 1.67em 0;
  max-height: 400px;
  overflow: auto;
}
.code-editor__container {
  background-color: #fafafa;
  box-sizing: border-box;
  font-size: 12px;
  font-variant-ligatures: common-ligatures;
  position: relative;
  text-align: left;
  white-space: pre-wrap;
  word-break: keep-all;
}
#code-editor__textarea,
#code-editor__pre {
  -webkit-font-smoothing: antialiased;
  display: inherit;
  font-family: inherit;
  font-size: inherit;
  font-style: inherit;
  font-variant-ligatures: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  line-height: inherit;
  padding: 10px;
  tab-size: inherit;
  text-indent: inherit;
  text-rendering: inherit;
  text-transform: inherit;
  white-space: inherit;
  word-break: inherit;
}
#code-editor__textarea {
  -webkit-text-fill-color: transparent;
  background: none;
  border: none;
  color: inherit;
  height: 100%;
  left: 0;
  outline: 0;
  overflow: hidden;
  position: absolute;
  resize: none;
  top: 0;
  width: 100%;
}
#code-editor__pre {
  margin: 0;
  pointer-events: none;
  position: relative;
}

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>Code Editor</title>
</head>
<body>
  <div class="code-editor">
    <div class="code-editor__container">
      <textarea id="code-editor__textarea" autocapitalize="off" autocomplete="off" autocorrect="off" spellcheck="false"></textarea>
      <pre id="code-editor__pre" aria-hidden="true"><br></pre>
    </div>
  </div>
</body>
</html>

容器上的 white-space: pre-wrap;引起了这一点。

您已经使用绝对定位将文本箱从流中取出 - 但是在其仍在那里之前和之后，线路断开，并且由于您强迫容器尊重它们，因此它们相应地将预元素推向。

（删除它将使您的文本方面的高度依次较小，因为这将其设置为容器的100％高度。但是我想在您的情况下这将是理想的效果？）

只需在您的＃code-editor __pre ID

中添加以下字段

  position: absolute;
  top: 0px;
  right: 0px;
  left: 0px;
  bottom: 0px;
  padding: 10px;

const codeEditor = document.getElementById("code-editor__textarea");
const codeRenderer = document.getElementById("code-editor__pre");
codeEditor.addEventListener("keyup", e => {
  codeRenderer.innerHTML = codeEditor.value;
});

*,
:after,
:before {
  box-sizing: inherit;
}
body {
  font-family: monospace;
  line-height: 1.5;
  margin: 0;
}
.code-editor {
  margin: 1.67em 0;
  max-height: 400px;
  overflow: auto;
}
.code-editor__container {
  background-color: #fafafa;
  box-sizing: border-box;
  font-size: 12px;
  font-variant-ligatures: common-ligatures;
  position: relative;
  text-align: left;
  white-space: pre-wrap;
  word-break: keep-all;
}
#code-editor__textarea,
#code-editor__pre {
  -webkit-font-smoothing: antialiased;
  display: inherit;
  font-family: inherit;
  font-size: inherit;
  font-style: inherit;
  font-variant-ligatures: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  line-height: inherit;
  padding: 10px;
  tab-size: inherit;
  text-indent: inherit;
  text-rendering: inherit;
  text-transform: inherit;
  white-space: inherit;
  word-break: inherit;
}
#code-editor__textarea {
  -webkit-text-fill-color: transparent;
  background: none;
  border: none;
  color: inherit;
  height: 100%;
  left: 0;
  outline: 0;
  overflow: hidden;
  position: absolute;
  resize: none;
  top: 0;
  width: 100%;
}
#code-editor__pre {
  margin: 0;
  pointer-events: none;
  position: absolute;
  top: 0px;
  right: 0px;
  left: 0px;
  bottom: 0px;
  padding: 10px;
}

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge" />
  <title>Code Editor</title>
</head>
<body>
  <div class="code-editor">
    <div class="code-editor__container">
      <textarea id="code-editor__textarea" autocapitalize="off" autocomplete="off" autocorrect="off" spellcheck="false"></textarea>
      <pre id="code-editor__pre" aria-hidden="true"><br></pre>
    </div>
  </div>
</body>
</html>

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