H 标签不会位于基线网格上

Question

我正在尝试使用 font-size:12px & line height:18px 的基线网格。

除了 H 标签外，大多数东西似乎都可以正常排列。特别是 h2 标记以基线指南结束。

这是我尝试基于此构建网站的第一次尝试，所以我不确定它是否意味着这样，因为它们的边距仍然允许其他所有内容到位，但标题不会显示为我期待。

结果截图：

CSS

/* reset.css */
html {margin:0;padding:0;border:0;}
body, div, span, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, code, del, dfn, em, img, q, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, dialog, figure, footer, header, hgroup, nav, section {margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline;}
article, aside, details, figcaption, figure, dialog, footer, header, hgroup, menu, nav, section {display:block;}
body {line-height:1.5;background:white;}
table {border-collapse:separate;border-spacing:0;}
caption, th, td {text-align:left;font-weight:normal;float:none !important;}
table, th, td {vertical-align:middle;}
blockquote:before, blockquote:after, q:before, q:after {content:'';}
blockquote, q {quotes:"" "";}
a img {border:none;}
:focus {outline:0;}

/* typography.css */
html {font-size:100.01%;}
body {font-size:75%;color:#444;font-family:"Helvetica Neue", Arial, Helvetica, sans-serif;background: url("../images/gridbg.gif") repeat scroll 0 0 #FFFFFF;}
h1, h2, h3, h4, h5, h6 {font-weight:normal;color:#111;}
h1 {font-size:3em;line-height:1;margin-bottom:0.5em;}
h2 {font-size:2em;margin-bottom:0.75em;}
h3 {font-size:1.5em;line-height:1;margin-bottom:1em;}
h4 {font-size:1.2em;line-height:1.25;margin-bottom:1.25em;}
h5 {font-size:1em;font-weight:bold;margin-bottom:1.5em;}
h6 {font-size:1em;font-weight:bold;}
h1 img, h2 img, h3 img, h4 img, h5 img, h6 img {margin:0;}

HTML

<h1>Welcome</h1>
<p>
Feel free to select a few different date/time combinations in order of preference.
This makes it easier for us to accomodate you when it is busy.
If your prefered slot is unavailable we will contact you to confirm whether you would like to use one of the alternatives you had previously specified. 
</p>
<p>
Feel free to select a few different date/time combinations in order of preference.
This makes it easier for us to accomodate you when it is busy.
If your prefered slot is unavailable we will contact you to confirm whether you would like to use one of the alternatives you had previously specified. 
</p>


<h2>Welcome</h2>
<p>
Feel free to select a few different date/time combinations in order of preference.
This makes it easier for us to accomodate you when it is busy.
If your prefered slot is unavailable we will contact you to confirm whether you would like to use one of the alternatives you had previously specified. 
</p>

<h3>Welcome</h3>
<p>
Feel free to select a few different date/time combinations in order of preference.
This makes it easier for us to accomodate you when it is busy.
If your prefered slot is unavailable we will contact you to confirm whether you would like to use one of the alternatives you had previously specified. 
</p>

Answer 1

基线网格的垂直间隔为18px。 h1 的高度为3em，2em 为h2。 3em 表示 three times the font size，因此 3*12px=36px。因此，网格贯穿这些标签。

基线网格并不意味着所有东西都应该完全适合网格，它意味着页面的主要部分被均匀地拟合和分开，例如你代码中的<p>s。

如果你觉得h标签和它后面的段落之间的差距太大，你可以在h标签上加一点margin-top并减少margin-botom。