Creating a <style> tag in JavaScript and inserting it into the <head> section of an HTML document is a common approach for adding or modifying page styles. The following provides a step-by-step example of implementing this process using JavaScript:

1. **Create a <style> element**: First, use the `document.createElement` method to create a new <style> element.

2. **Set the style content**: Then, utilize the `textContent` property or the `appendChild` method combined with `createTextNode` to define CSS rules.

3. **Insert the <style> element into the document head**: Finally, employ the `document.head.appendChild` method to add the newly created <style> tag to the document's <head> section.

Here is a specific implementation:

```javascript
// Create a new style element
var style = document.createElement('style');

// Set CSS rules
// Example: Apply background color and font color to the body
style.textContent = `\n  body {\n    background-color: #f3f3f3;\n    color: #333;\n  }\n`;

// Insert the style element into the head
document.head.appendChild(style);
```

In this example, I configured the page background color and font color. Naturally, you can incorporate any CSS rules as required. This technique enables dynamic control over page styles and can be leveraged to adjust styles based on user interactions or other events.

How to create a < style > tag with Javascript?

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