How Can You Determine Browser Support for Specific CSS Properties and Values?

Using CSS Queries to Determine Browser Support

The need to ascertain browser support for specific CSS properties or values is crucial for ensuring the compatibility of web pages across different devices and browsers. One of the most comprehensive methods to do this is through the CSS.supports API, supported by all major browsers except Internet Explorer.

Checking CSS Properties via CSS.supports()

To verify if a CSS property is supported by a browser, you can utilize the CSS.supports() method:

<code class="javascript">console.log(CSS.supports('display', 'flex')); // true (if flexbox is supported)</code>

This utility evaluates if the specified property is recognized by the browser. If supported, it returns true; otherwise, it returns false.

Checking CSS Values via CSS.supports()

The CSS.supports() API also allows you to check for the support of specific CSS values for a given property:

<code class="javascript">console.log(CSS.supports('text-decoration-style', 'blink')); // false (if 'blink' is not supported)</code>

The browser will compare the provided value with the property's possible values and report true if it's supported, or false if it's not recognized.

Alternative Methods for Value Checking

For situations where CSS.supports() is not supported or when you need to dynamically assign values in JavaScript, you can opt for an alternative method:

Set and Check:

• Set the desired CSS property to a specific value (e.g., div.style.fontSize = '2rem')
• Verify if the browser has maintained the assigned value by reading it back (e.g., div.style.fontSize)
• If the returned value matches the value you assigned, it signifies browser support

JavaScript Conditional Statements:

<code class="javascript">if (typeof document.body.style.transition === 'string') {
  // transition is supported
}</code>

Note: This method may introduce unnecessary style modifications to the page.

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