Eingabe und Auswahl haben unterschiedliche vertikale Positionen in derselben Zeile

Question

Ich verwende schwebende Tabs für diese Website. Ich habe den Code leicht geändert, um Eingabe und Auswahl in einer Zeile zusammenzufassen. In der Edge-Version 114.0.1823.67 und der Chrome-Version 114.0.5735.199 hat die Grundlinie eine andere vertikale Position. In der Firefox-Version 115.0 hat die Grundlinie dieselbe vertikale Position. Code:

@import url('https://fonts.google.com/specimen/Lato?selection.family=Lato');
 :root {
  --main-color: #ee6e73;
  --second-color: #333;
  --input-color: #9e9e9e;
}

body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Lato', sans-serif;
  background-color: #fcfcfc;
  flex-direction: column;
}

form {
  padding: 20px 40px;
}

form h1 {
  color: var(--second-color);
  letter-spacing: 1px;
  margin: 10px 0px;
}

.form-group {
  position: relative;
  padding: 20px 0;
  width: 300px;
  max-width: 100%;
}

.form-group input,
select {
  background-color: transparent;
  border: none;
  border-bottom: 1px solid var(--input-color);
  color: var(--second-color);
  font-size: 16px;
  padding: 10px 0;
  display: block;
  width: 100%;
}

.form-group label {
  color: var(--input-color);
  font-size: 16px;
  font-weight: 100;
  position: absolute;
  pointer-events: none;
  top: 0;
  transform: translateY(30px);
  transition: all 0.2s ease-in-out;
  left: 0px;
}

.form-group input:focus,
.form-group select:focus {
  border-bottom-color: var(--main-color);
  outline: none;
}

.form-group input:valid+label,
.form-group input:focus+label {
  color: var(--main-color);
  font-size: 14px;
  transform: translateY(0);
}

input[type="button"] {
  background-color: var(--main-color);
  border: 2px solid var(--main-color);
  border-radius: 2px;
  box-sizing: border-box;
  color: #fff;
  cursor: pointer;
  font-size: 16px;
  padding: 15px 0;
  margin-top: 15px;
  width: 100%;
}

input[type="button"]:hover {
  background-color: #fff;
  color: var(--main-color);
}

input[type="button"]:active {
  border-color: #fff;
}

input[type="button"]:focus {
  outline: none;
}

<form>
  <h1>CSS Floating Labels</h1>
  <fieldset>
    <div style="display: flex; flex-direction: row; justify-content: flex-start;">
      <div class="form-group">
        <input type="text" required/>
        <label>Username</label>
      </div>
      <div class="form-group">
        <select>
          <option value="">Test</option>
        </select>
      </div>
      <div class="form-group">
        <input type="password" required/><label>Password</label>
      </div>
    </div>
  </fieldset>
  <input type="button" value="Submit" />
</form>

Ich habe versucht, es mit vertical-position:bottom zu lösen, aber leider ohne Erfolg.

Answer 1

select 因具有挑战性的样式而臭名昭著。话虽这么说，我更改了填充 - 可能甚至需要执行浏览器特定的样式，但在这里我只是更改了填充： padding: 1.225em 0; FWIW我使用em来帮助我的大脑更轻松地处理事情。

---

更新：使用一组网格的完全不同的替代方案，因为我们希望 X 和 Y 放置将标签和字段放在行上的同一位置。注意我命名了行/列并使用了它。 一些包装器和类（我不喜欢在 CSS 样式中使用元素标签，因此我们可以更改元素类型而不必更改 CSS）

• 使按钮成为

@import url('https://fonts.google.com/specimen/Lato?selection.family=Lato');
 :root {
  --main-color: #ee6e73;
  --second-color: #333;
  --input-color: #9e9e9e;
}

html,
body,
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-size: 16px;
}

body {
  height: 100vh;
  /* assumed you want to super center the form */
  display: grid;
  /* same as center of both align/justify ref
https://developer.mozilla.org/en-US/docs/Web/CSS/place-items */
  place-items: center;
  font-family: 'Lato', sans-serif;
  background-color: #fcfcfc;
}

.form-form {
  padding-top: 1.25em;
  padding-bottom: 1.25em;
  padding-left: 1.5em;
  padding-right: 1.5em;
  display: grid;
  grid-template-columns: 1fr;
  /* fieldset takes whatever space is left over - 1fr */
  grid-template-rows: auto 1fr 1em auto;
  grid-template-areas: "formheader" "forminputs" "." "formbutton";
  align-items: center;
  border: solid cyan 1px;
  width: 100%;
}

.form-form .form-header {
  grid-area: formheader;
  color: var(--second-color);
  letter-spacing: 1px;
  margin-top: 0.625em;
  margin-bottom: 0.625em;
}

.fieldset-container {
  grid-area: forminputs;
  display: grid;
  grid-template-rows: 1fr;
  /* width of each field/column */
  grid-template-columns: repeat(3, 18.75em);
  border-bottom: 1px solid var(--input-color, #00FF00);
  padding-bottom: 0.5em;
  margin-bottom: 0.5em;
}

.form-group {
  padding-top: 1.25em;
  /*padding-bottom: 1.25em;*/
  display: grid;
  grid-template-columns: [only-one] 1fr;
  grid-template-rows: [form-things] auto 1fr;
  /* we COULD use the areas but we want to put them in the same line */
  grid-template-areas: "labels" "inputs";
}

.form-group .form-group-label {
  /* could also use the named line/row */
  grid-area: labels;
  padding-top: 1.25em;
  padding-bottom: 1.25em;
  color: var(--input-color);
  font-weight: 100;
  pointer-events: none;
  background-color: transparent;
}

.form-group .form-group-input {
  /* we named the line/column so use that not the "area" name */
  /*  grid-area: inputs;*/
  grid-row-start: form-things;
  grid-column-start: only-one;
  background-color: transparent;
  border: none;
  color: var(--second-color);
  padding-top: 1.25em;
  padding-bottom: 1.25em;
}

.form-group .form-group-input:focus,
{
  border-bottom-color: var(--main-color);
  outline: none;
}

.form-group .form-group-input:valid~label,
.form-group .form-group-input:focus~label {
  color: var(--main-color);
  font-size: 0.875em;
  transform: translateY(0);
}

.form-button {
  grid-area: formbutton;
  background-color: var(--main-color);
  border: 2px solid var(--main-color);
  /* made bigger as the 2px did not really show */
  border-radius: 0.5em;
  color: #fff;
  cursor: pointer;
  height: 3em;
  /* moved to grid as a row but not named area "."
 margin-top: 1em;*/
}

.form-button:hover {
  background-color: #fff;
  color: var(--main-color);
}

.form-button:active {
  border-color: #fff;
}

.form-button:focus {
  outline: none;
  border-color: #00FF00;
}

<form class="form-form">
  <h1 class="form-header">CSS Floating Labels</h1>
  <fieldset>
    <div class="fieldset-container">
      <div class="form-group">
        <input id="form-input-1" class="form-group-input" type="text" required/>
        <label for="form-input-1" class="form-group-label">Username</label>
      </div>
      <div class="form-group">
        <!-- <label class="form-group-label">TesterOut</label> -->
        <select class="form-group-input">
          <option value="">Test</option>
          <option value="water">Water</option>
          <option value="milk">Milk</option>
        </select>
      </div>
      <div class="form-group">
        <input class="form-group-input" type="password" required/><label class="form-group-label">Password</label>
      </div>
    </div>
  </fieldset>
  <button class="form-button" type="button">Submit</button>
</form>