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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/CSS/escape_static below:

CSS: escape() static method - Web APIs

CSS: escape() static method

Baseline Widely available

The CSS.escape() static method returns a string containing the escaped string passed as parameter, mostly for use as part of a CSS selector.

Syntax Parameters
str

The string to be escaped.

Return value

The escaped string.

Examples Basic results
CSS.escape(".foo#bar"); // "\\.foo\\#bar"
CSS.escape("()[]{}"); // "\\(\\)\\[\\]\\{\\}"
CSS.escape('--a'); // "--a"
CSS.escape(0); // "\\30 ", the Unicode code point of '0' is 30
CSS.escape('\0'); // "\ufffd", the Unicode REPLACEMENT CHARACTER
In context uses

To escape a string for use as part of a selector, the escape() method can be used:

const element = document.querySelector(`#${CSS.escape(id)} > img`);

The escape() method can also be used for escaping strings, although it escapes characters that don't strictly need to be escaped:

const element = document.querySelector(`a[href="#${CSS.escape(fragment)}"]`);
Specifications Browser compatibility See also

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