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console 命令行工具 X clear

                    
>
console
<!DOCTYPE html>
<html>
    <head>
        <title>My website.</title>
    </head>
    <body>
        <div><h1>Welcome!<h1></div>
        <div>This is my website.</div>
        <div>This is my website.<div>
        <button CLASS='BUTTON' id="button_1">我是按钮一号</button> 
        <button CLASS='BUTTON' id="button_2">我是按钮二号</button>
    <body>
<html>
div{
    background-color:pink;
}
.BUTTON{
    color:darkgreen;
}
#button_2{
    font-weight:bold;
}