Horizontally aligning blocks on text baseline

问题

I have the following HTML code:

<header>
    <h1>Title</h1>

    <nav>
        <ul>
            <li>One</li>
            <li>Two</li>
            <li>Three</li>
        </ul>
    </nav>
</header>

I am looking to turn this into a single line on the top of my web page by floating right the <nav>.

However, because the <h1> has a much bigger font size than the <li> elements the text gets misaligned. I want the elements to be aligned on the baseline. In a picture:

Note the red line for the baseline. This is what I have right now:

#float, #nofloat { width: 300px; }

ul, h1, nav, p { margin: 0; padding: 0; }

h1 {
  display: inline-block;
  font-size: 3rem;
}

nav { display: inline-block; }
ul { list-style-type: none; }
ul > li { display: inline; }
ul > li:after { content: " | "; }
ul > li:last-child:after { content: ""; }

#float nav { float: right; }

<p>Everything is aligned to baseline before floating:</p>
<div id="nofloat">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

<p>But after floating it's messed up:</p>
<div id="float">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

回答1:

You can simply add text-align:right to your nav if you have a fixed width

#float,
#nofloat {
  width: 300px;
}

ul,
h1,
nav,
p {
  margin: 0;
  padding: 0;
}
h1 {
  display: inline-block;
  font-size: 3rem;
  width:auto;
}
nav {
  display: inline-block;
  width:200px
}
ul {
  list-style-type: none;
}
ul > li {
  display: inline;
}
ul > li:after {
  content: " | ";
}
ul > li:last-child:after {
  content: "";
}
#float nav {
 text-align:right
}

<p>Everything is aligned to baseline before floating:</p>
<div id="nofloat">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

<p>But after floating it's messed up:</p>
<div id="float">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

Plus since inline-block has gap issues (fixable) you can use use display:table/table-cell

#float,
#nofloat {
  width: 300px;
  display: table;
}

ul,
h1,
nav,
p {
  margin: 0;
  padding: 0;
}
h1 {
  display: table-cell;
  font-size: 3rem;
  width:auto;
}
nav {
  display: table-cell;
  width:200px
}
ul {
  list-style-type: none;
}
ul > li {
  display: inline;
}
ul > li:after {
  content: " | ";
}
ul > li:last-child:after {
  content: "";
}
#float nav {
 text-align:right
}

<p>Everything is aligned to baseline before floating:</p>
<div id="nofloat">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

<p>But after floating it's messed up:</p>
<div id="float">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

回答2:

Your HTML mark-up lends itself to a solution using CSS tables.

Apply display: table to header, and set the width to 100% which will force it to take on the width of the parent container.

Apply display: table-cell to nav and set width: 1% to force it to have a shrink-to-fit width. To prevent text wrapping, set white-space: nowrap.

This will work fine as long as your title can fit in the remaining space, but you can probably adjust the details based on your layout.

#float, #nofloat { width: 300px; }

ul, h1, nav, p { margin: 0; padding: 0; }

h1 {
  display: inline-block;
  font-size: 3rem;
}

nav { display: inline-block; }
ul { list-style-type: none; }
ul > li { display: inline; }
ul > li:after { content: " | "; }
ul > li:last-child:after { content: ""; }

header {
  border: 1px dotted gray;
}

#float header {
  display: table;
  width: 100%; /* the parent div has a width */
}

#float nav { 
  display: table-cell;
  width: 1%; /* forces this cell to shrink-to-fit */
  white-space: nowrap;
  border: 1px dotted blue;
}

<p>Everything is aligned to baseline before floating:</p>
<div id="nofloat">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

<p>But after floating it's messed up:</p>
<div id="float">
  <header>
    <h1>Title</h1>

    <nav>
      <ul>
        <li>One</li>
        <li>Two</li>
        <li>Three</li>
      </ul>
    </nav>
  </header>
</div>

来源：https://stackoverflow.com/questions/30073823/horizontally-aligning-blocks-on-text-baseline