css - 是否可以为 HTML5 对话框背景添加模糊效果？

Question

我正在尝试为 dialog 的背景添加模糊效果(我意识到 dialog 目前只提供有限的支持 - 我使用的是 Chrome v66)。

我试过为 ::backdrop 添加模糊滤镜css(运气不好)和backdrop-filter尚不支持。

有人知道我应该怎么做吗？

window.onload = function() {
  document.getElementById('mydialog').showModal();
}

dialog::backdrop {
  background: rgba(255, 0, 0, .25);
}

/* attempt #1 - using a blur filter */
dialog::backdrop {
  -webkit-filter: blur(2px);
  -moz-filter: blur(2px);
  -o-filter: blur(2px);
  -ms-filter: blur(2px);
  filter: blur(2px);
}

/* attempt #2 - using backdrop-filter */
dialog::backdrop {
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

/* attempt #3 - using an svg */
dialog::backdrop {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='100%' height='100%'><defs><filter id='blur'><feGaussianBlur stdDeviation='5' /></filter></defs><rect filter='url(%23blur)' fill='rgba(255,255,255,0.5)' x='0' y='0' width='100%' height='100%'/></svg>");
}

Here is some other text that I want blurred.
<dialog id="mydialog">This is the dialog window</dialog>

Answer 1

使用背景滤镜:

dialog::backdrop {
        backdrop-filter: blur(1px);
}