Source code
Revision control
Copy as Markdown
Other Tools
<!DOCTYPE html>
<style>
.dialog-default-ua-style {
position: absolute;
overflow: auto;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
border: solid;
padding: 1em;
background: white;
color: black;
}
#dialog {
margin: auto;
height: 100px;
width: 100px;
top: 100px;
z-index: 1000;
background: green;
}
#backdrop {
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: rgba(0,0,0,0.1);
z-index: 100;
}
</style>
<body>
Test for the default user agent style of dialog::backdrop. The test passes if
there is a green box, above a very lightly translucent gray box spanning the
viewport.
<div id="backdrop"></div>
<div class="dialog-default-ua-style" id="dialog"></div>
</body>