form和table是否可以作为标签选择器（派生选择器，子类选择器）中的一部分

我就是想知道为什么form>table>tr>td选不到td，或者让table包含form写成table>form>tr>td，就是选不到td，咋回事！

<!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>Document</title>
</head>
<style type="text/css">
    form>table>tr>td
    {
        color: red;
    }
</style>
<body>
    <form action="">
        <table>
            <tr>
                <td>1</td>
            </tr>
        </table>
    </form>
</body>
</html>

去掉>

 <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>Document</title>
<style type="text/css">
   form table tr>td {
        color: red;
    }
</style></head>

<body>
    <form action="">
        <table>
            <tbody><tr>
                <td>1</td>
            </tr>
        </tbody></table>
    </form>
    <form action="">
123
    </form>
</body></html>

图片说明

<!DOCTYPE html>

<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>Document</title>
</head>
<style type="text/css">
    tr>td {
        color: red;
    }
</style>

<body>
    <form action="">
        <table>
            <tr>
                <td>1</td>
            </tr>
        </table>
    </form>
</body>

或者将table加上id,然后这么写：

Document
<br> #myform tr>td {<br> color: red;<br> }<br>

123