::highlight()
::highlight()
CSS 伪元素 将样式应用于自定义高亮显示。
自定义高亮显示是一组 Range
对象,并使用 HighlightRegistry
在网页上注册。
允许的属性
只有某些 CSS 属性可以与 ::highlight()
一起使用
color
background-color
text-decoration
及其关联属性text-shadow
-webkit-text-stroke-color
、-webkit-text-fill-color
和-webkit-text-stroke-width
特别是,background-image
被忽略。
语法
css
::highlight(custom-highlight-name)
示例
突出显示字符
HTML
html
<p id="rainbow-text">CSS Custom Highlight API rainbow</p>
CSS
css
#rainbow-text {
font-family: monospace;
font-size: 1.5rem;
}
::highlight(rainbow-color-1) {
color: #ad26ad;
text-decoration: underline;
}
::highlight(rainbow-color-2) {
color: #5d0a99;
text-decoration: underline;
}
::highlight(rainbow-color-3) {
color: #0000ff;
text-decoration: underline;
}
::highlight(rainbow-color-4) {
color: #07c607;
text-decoration: underline;
}
::highlight(rainbow-color-5) {
color: #b3b308;
text-decoration: underline;
}
::highlight(rainbow-color-6) {
color: #ffa500;
text-decoration: underline;
}
::highlight(rainbow-color-7) {
color: #ff0000;
text-decoration: underline;
}
JavaScript
js
const textNode = document.getElementById("rainbow-text").firstChild;
if (!CSS.highlights) {
textNode.textContent =
"The CSS Custom Highlight API is not supported in this browser!";
}
// Create and register highlights for each color in the rainbow.
const highlights = [];
for (let i = 0; i < 7; i++) {
// Create a new highlight for this color.
const colorHighlight = new Highlight();
highlights.push(colorHighlight);
// Register this highlight under a custom name.
CSS.highlights.set(`rainbow-color-${i + 1}`, colorHighlight);
}
// Iterate over the text, character by character.
for (let i = 0; i < textNode.textContent.length; i++) {
// Create a new range just for this character.
const range = new Range();
range.setStart(textNode, i);
range.setEnd(textNode, i + 1);
// Add the range to the next available highlight,
// looping back to the first one once we've reached the 7th.
highlights[i % 7].add(range);
}
结果
规范
规范 |
---|
CSS Custom Highlight API Module Level 1 # custom-highlight-pseudo |
浏览器兼容性
BCD 表格仅在浏览器中加载