Why is the reference to layui file invalid?

Question

Why is the reference to layui file invalid? Code:

<link rel="stylesheet" type="text/css" href="static/layui/css/layui.css"> <script type="text/javascript" src= "static/layui/layui.js"></script>

Answer 1

<link rel="stylesheet" type="text/css" href="/static/layui/css/layui.css">

static is missing "/"