[Webkit-unassigned] [Bug 247810] border shorthand serialization doesn't round-trip

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247810

--- Comment #1 from Oriol Brufau <obrufau at igalia.com> ---
This also affects other properties, as can be easily shown by the fact that WebKit doesn't even ensure that all longhands are present.

var allCSSProps = new Set();
for (let obj = document.createElement("div").style; obj; obj = Reflect.getPrototypeOf(obj)) {
  for (let name of Object.getOwnPropertyNames(obj)) {
    let prop = name.replace(/[A-Z]/g, c => "-" + c.toLowerCase());
    if (CSS.supports(prop, "initial")) {
      allCSSProps.add(prop);
    }
  }
}
var style = document.createElement("div").style;
document.documentElement.style.cssText = "all: initial; direction: initial; unicode-bidi: initial";
var cs = getComputedStyle(document.documentElement);
var bad = {};
for (let prop of allCSSProps) {
  const value = cs.getPropertyValue(prop);
  style.cssText = "";
  style.setProperty(prop, value);
  if (style.length > 1) {
    let longhands = [...style];
    for (let longhand of longhands) {
      style.cssText = "";
      style.setProperty(prop, value);
      style.removeProperty(longhand);
      if (style.getPropertyValue(prop) !== "") {
        bad[prop] ||= [];
        bad[prop].push(longhand);
      }
    }
  }
}
bad;


{
  border: ["border-image-source", "border-image-slice", "border-image-width", "border-image-outset", "border-image-repeat"],
  font: ["font-style", "font-variant-caps", "font-weight", "font-stretch", "line-height", "font-size-adjust", "font-kerning", "font-variant-alternates", "font-variant-ligatures", "font-variant-numeric", "font-variant-east-asian", "font-variant-position", "font-feature-settings", "font-optical-sizing", "font-variation-settings", "font-palette"],
  font-synthesis: ["font-synthesis-weight", "font-synthesis-style", "font-synthesis-small-caps"],
  font-variant: ["font-variant-numeric", "font-variant-caps", "font-variant-alternates", "font-variant-east-asian", "font-variant-position"],
  offset: ["offset-path", "offset-distance", "offset-position", "offset-anchor", "offset-rotate"],
}

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