Troubleshooting: Browser fails to update after CSSStyleRule modification using JavaScript

When making changes to CSS properties of elements using JS methods like CSSStyleSheet, insertRule, deleteRule, or CSSStyleRule.style.setProperty(), I noticed that the underlying CSS is updated but the page does not reflect these changes immediately.

The changes only take effect after triggering a reflow, such as modifying an attribute of the element, even if it's invalid.

This issue might be related to the question posed here: What are the conditions under which a browser will re-assess and reapply CSS selectors and styles?

What is the best practice for modifying CSS with JavaScript? Is there a recommended method besides manipulating class strings or using unconventional attribute insertion and deletion techniques?

Note: Testing conducted on Edge / Chromium browsers

Answer №1

Upon reviewing your message, it seems like there are some straightforward techniques that you may not be familiar with:

element.style = stylestring (For example: "display:block; color:red;")

element.setAttribute('style', stylestring)

These methods will apply inline styles, giving priority to the modified properties over the external CSS and producing an immediate effect.

As for whether this is the recommended approach, that's a difficult question to answer. I'll defer to others who are more knowledgeable in W3C standards...

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