ant-design/components/_util/styleChecker.ts

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import canUseDom from 'rc-util/lib/Dom/canUseDom';
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import { isStyleSupport } from 'rc-util/lib/Dom/styleChecker';
export const canUseDocElement = () => canUseDom() && window.document.documentElement;
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export { isStyleSupport };
let flexGapSupported: boolean;
export const detectFlexGapSupported = () => {
if (!canUseDocElement()) {
return false;
}
if (flexGapSupported !== undefined) {
return flexGapSupported;
}
// create flex container with row-gap set
const flex = document.createElement('div');
flex.style.display = 'flex';
flex.style.flexDirection = 'column';
flex.style.rowGap = '1px';
// create two, elements inside it
flex.appendChild(document.createElement('div'));
flex.appendChild(document.createElement('div'));
// some browser may not repaint when remove nodes, so we need create a new layer to detect.
const container = document.createElement('div');
container.style.position = 'absolute';
container.style.zIndex = '-9999';
container.appendChild(flex);
// append to the DOM (needed to obtain scrollHeight)
document.body.appendChild(container);
flexGapSupported = flex.scrollHeight === 1; // flex container should be 1px high from the row-gap
document.body.removeChild(container);
return flexGapSupported;
};