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create style in js

Constructed StyleSheets

CSSStyleSheet

adoptedStyleSheets

Shadow Roots (Shadow DOM)

Documents

demo

// Create our shared stylesheet:
const sheet = new CSSStyleSheet();
sheet.replaceSync('a { color: red; }');

// Apply the stylesheet to a document:
document.adoptedStyleSheets = [sheet];

// Apply the stylesheet to a Shadow Root:
const node = document.createElement('div');
const shadow = node.attachShadow({ mode: 'open' });
shadow.adoptedStyleSheets = [sheet];

https://developers.google.com/web/updates/2019/02/constructable-stylesheets

insertAdjacentHTML

document.head.insertAdjacentHTML("beforeend", `<style>body{background:red}</style>`)

styleSheet.cssText

   const styleNode = document.createElement('style');
   styleNode.type = "text/css";

   // browser detection (based on prototype.js)
   if(!!(window.attachEvent && !window.opera)) {
        styleNode.styleSheet.cssText = 'span { color: rgb(255, 0, 0); }';
   } else {
        var styleText = document.createTextNode('span { color: rgb(255, 0, 0); } ');
        styleNode.appendChild(styleText);
   }

   document.getElementsByTagName('head')[0].appendChild(styleNode);

innerHTML

  const style = document.createElement('style');

  style.innerHTML = `
    #target {
     color: blueviolet;
    }
  `;

  document.head.appendChild(style);

style.sheet.insertRule

  const style = document.createElement('style');

  style.sheet.insertRule('#target {color: darkseagreen}');

  document.head.appendChild(style);

CSSStyleSheet

// Create our shared stylesheet:
const sheet = new CSSStyleSheet();
sheet.replaceSync('#target {color: darkseagreen}');

// Apply the stylesheet to a document:
document.adoptedStyleSheets = [sheet];

https://dev.to/karataev/set-css-styles-with-javascript-3nl5

style

const div = document.createElement('div');

div.style.color = "red";

document.head.appendChild(style);

setAttribute

https://www.w3schools.com/JSREF/met_element_setattribute.asp

const div = document.createElement('div');

div.setAttribute(`style`, `color: red;`)

document.head.appendChild(style);

refs

style element & web components

https://www.cnblogs.com/xgqfrms/p/13614365.html

https://*.com/questions/524696/how-to-create-a-style-tag-with-javascript

https://www.w3schools.com/JSREF/prop_html_style.asp

https://www.w3.org/wiki/Dynamic_style_-_manipulating_CSS_with_JavaScript

https://www.geeksforgeeks.org/how-to-create-a-style-tag-using-javascript/

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