HighlightRegistry

The HighlightRegistry interface doesn't inherit any properties.

HighlightRegistry.size 只读

Returns the number of Highlight objects currently registered.

The HighlightRegistry interface doesn't inherit any methods.

HighlightRegistry.clear()

Remove all Highlight objects from the registry.

HighlightRegistry.delete()

Remove the named Highlight object from the registry.

HighlightRegistry.entries()

Returns a new iterator object that contains each Highlight object in the registry, in insertion order.

HighlightRegistry.forEach()

Calls the given callback once for each Highlight object in the registry, in insertion order.

HighlightRegistry.get()

Gets the named Highlight object from the registry.

HighlightRegistry.has()

Returns a boolean asserting whether a Highlight object is present the registry or not.

HighlightRegistry.keys()

An alias for HighlightRegistry.values().

HighlightRegistry.set()

Adds the given Highlight object to the registry with the given name, or updates the named Highlight object, if it already exists in the registry.

HighlightRegistry.values()

Returns a new iterator object that yields the Highlight objects in the registry, in insertion order.

以下示例演示了如何创建范围、为其实例化新的 Highlight 对象，以及使用 HighlightRegistry 注册高亮，以在页面上对其进行样式化

HTML

<p id="foo">CSS Custom Highlight API</p>

CSS

::highlight(my-custom-highlight) {
  background-color: peachpuff;
}

JavaScript

const text = document.getElementById("foo").firstChild;

if (!CSS.highlights) {
  text.textContent =
    "The CSS Custom Highlight API is not supported in this browser!";
}

// Create a couple of ranges.
const range1 = new Range();
range1.setStart(text, 0);
range1.setEnd(text, 3);

const range2 = new Range();
range2.setStart(text, 21);
range2.setEnd(text, 24);

// Create a custom highlight for these ranges.
const highlight = new Highlight(range1, range2);

// Register the ranges in the HighlightRegistry.
CSS.highlights.set("my-custom-highlight", highlight);

结果

• CSS 自定义高亮 API
• CSS 自定义高亮 API：Web 上文本范围高亮的未来