DOCTYPE打断第n个子背景色 - DOCTYPE breaks nth-child background colors

我的CSS已验证，但在添加<!DOCTYPE html>时仍会中断。我做错了什么？我搜索了论坛，常见的回复似乎是[添加高度：100%到正文，html标签。做了，但没有运气。

无DOCTYPE：http://www.babeweiser.com/rockhistory/使用DOCTYPE：http://www.babeweiser.com/rockhistory/test.php

CSS

html, body 
{
height: 100%;
width: 100%;
background: #333333; 
}
div.Container
{
margin: auto;
width: 90%;
background: #5e6d3d;
padding: 10px;
}
p 
{
font-family: sans-serif;
}
.Table
{
    display: Table;
}
.Title
{
    display: table-caption;
    text-align: center;
    font-weight: bold;
    font-size: larger;
    background: #c6d4a8;
}
.Heading
{
    display: table-row;
    font-weight: bold;
    text-align: center;
}
.Row
{
    display: table-row;
    height: 100%; width: 100%;
}
div.row:nth-child(odd)
{
background: #daedb2;
}
div.row:nth-child(even)
{
background: #c6d4a8;
}
.Cell
{
    display: table-cell;
    padding: 15px;
}
select:required:invalid 
{
color: #999;
}
option {
color: #000;
}

test.php：

<!DOCTYPE html>
<html>
<head>
<title>Today in Rock History</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"> </script>
<link rel="stylesheet" type="text/css" href="rockhistory2.css">
<script>
$(function() {
  $.ajax({  
      type: "POST",  
      url: "pull_history2.php",  
      data: "" + status,  
      success: function(data){  
          document.getElementById("demo").innerHTML = data;
      }  
  });
});
</script>
<script>
$(document).ready(function()
{   
    $(document).on('submit', '#reg-form', function()
    {
        var data = $(this).serialize();
        $.ajax({
        type : 'POST',
        url  : 'pull_history2.php',
        data : data,
        success :  function(data)
                {       
                document.getElementById("demo").innerHTML = data;
                }
        });
        return false;
    });
});
</script>

</head>
<body>
<div class="Container">
<form id="reg-form" name="reg-form" method="post">
<select name="month" required  id="month" size="1">
<option value="" disabled selected>Month</option>
<?php 
$mo = 1; 
while($mo <= 12) {
    echo '<option value= "' . $mo . '">' . date("F", mktime(0, 0, 0, $mo+1, 0, 0)) . '</option>';
    echo "'n";
    $mo++;
} 
?>
</select>
<select name="day" required id="day" size="1">
<option value="" disabled selected>Day</option>
<?php
$da = 1; 
while($da <= 31) {
    echo '<option value= "' . $da . '">' . date("j", mktime(0, 0, 0, 0, $da, 0)) . '</option>';
    echo "'n";
    $da++;
} 
?>
 </select>
 <button type="submit" >Go</button>
 </form>
    <p id="demo"></p>
</div>
</body>
</html>

pull_history2.php：

<?php
if($_POST) {
    $month= $_POST['month'];
    $day= $_POST['day'];
} else {
    $month = date('n');
    $day = date('j');
}
$tdate=date("F j", mktime(0, 0, 0, $month, $day, 0));
?>
<div class="Table">
    <div class="Title">
        <p><? echo "This Day in Rock History for $tdate" ?></p>
    </div>
    <div class-"heading"> 
    </div>
<?php
    $db = mysql_connect("localhost","xxx", "xxx");
    mysql_select_db("babewe5_wlup",$db);
    $result = mysql_query("SELECT * FROM RockHistory081512 WHERE      month=$month AND day=$day ORDER BY year",$db);
        if (!$result) { echo("ERROR: " . mysql_error() . "'n$SQL'n"); }
            while ($row = mysql_fetch_array ($result)) {
            ?>
            <div class="Row">
                    <div class="Cell">
                            <p><? echo $row["year"] ?></p>
                    </div>
                    <div class="Cell">
                            <p><? echo $row["history"] ?></p>                       
                    </div>
            </div>
            <?
            }
            mysql_free_result ($result);
            ?>
<div class="Row">
     <div class="Cell">
     </div>
     <div class="Cell">
           <p><small>Copyright &copy; <? echo date("Y"); ?> Tim Spencer</p>
     </div>
</div>

您在CSS中使用.Row和.row。一个是首字母大写，另一个不是。将div.row:nth-child更改为div.Row:nth-child。

应用doctype会对文档强制执行一组规则。在没有doctype的情况下，两者被相同地处理。

它是区分大小写的。或者将类名修改为"row"（小写字母）。或者更改样式表中的相关样式。

div.Row：第n个子（偶数）->（R大写）。。div.行：第n个子（奇数）

您最好检查第n个选择器的浏览器兼容性。。IE 9及更高版本支持它。

https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-子