/**
 * Merging two inline `style` strings, declaration by declaration.
 *
 * The split follows the CSS Syntax Level 3 tokenizer far enough to find the
 * declaration boundaries a browser finds:
 * - a `;` ends a declaration only at the top level - not inside a "..." or '...'
 *   string, a comment, or a (...), [...] or {...} block, so `url(a;b)`,
 *   `url("data:image/png;base64,...")` and `var(--x, url(a;b))` stay whole;
 * - a declaration is split at its FIRST top-level `:`, so a value such as
 *   `url(http://x/y.png)` keeps every later colon;
 * - a backslash escapes the next code point everywhere (`\;`, `\"`), and inside a
 *   string a backslash before a newline is a line continuation; an unescaped
 *   newline ends a string (the tokenizer's bad-string), as it does in a browser;
 * - comments are dropped from property names; values are kept verbatim.
 *
 * This works on the attribute's value - the text after HTML character references
 * are resolved - so it is the CSS layer only.
 *
 * Property names compare ASCII case-insensitively (`COLOR` overrides `color`);
 * custom properties (`--name`) compare case-sensitively, as CSS defines them. A
 * declaration with no name or no colon is dropped, as a browser drops it; an
 * empty value is dropped too, except for a custom property, where it is valid.
 * The value, including any `!important`, is carried as written.
 */
interface Style_Declaration {
    name: string;
    value: string;
}
/** The declarations of an inline style string, in order. */
export declare function parse_style_declarations(style: string): Style_Declaration[];
/**
 * `base` merged with `extra`, declaration by declaration, as one style string.
 * Where both set a property, `extra` wins when `extra_wins` is true, otherwise
 * `base` does. The result reads as the browser reads the two strings written
 * loser-then-winner:
 * - the losing side's remaining declarations come first and the winner's after
 *   them, so a losing shorthand (`background`) cannot reset a longhand the winner
 *   set (`background-image`);
 * - a later declaration replaces an earlier one of the same property, except that
 *   a normal declaration does not replace an `!important` one.
 */
export declare function merge_style(base: string, extra: string, extra_wins: boolean): string;
export {};
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