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Apply CSS shorthand expansion to IE<9 only #1953

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Apply CSS shorthand expansion to IE<9 only #1953

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11 changes: 10 additions & 1 deletion src/browser/ui/dom/CSSPropertyOperations.js
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Original file line number Diff line number Diff line change
Expand Up @@ -32,8 +32,15 @@ var processStyleName = memoizeStringOnly(function(styleName) {
return hyphenateStyleName(styleName);
});

var hasShorthandPropertyBug = false;
var styleFloatAccessor = 'cssFloat';
if (ExecutionEnvironment.canUseDOM) {
try {
// IE8 throws "Invalid argument." if resetting shorthand style properties.
document.createElement('div').style.font = '';
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Why does this throw? All the info online I can find indicate that it silently does the wrong thing.

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>>document.createElement('div').style.font = '';
  "Invalid argument." (error)
>>document.createElement('div').style.fontSize = '';
  ""

} catch (e) {
hasShorthandPropertyBug = true;
}
// IE8 only supports accessing cssFloat (standard) as styleFloat
if (document.documentElement.style.cssFloat === undefined) {
styleFloatAccessor = 'styleFloat';
Expand Down Expand Up @@ -118,7 +125,7 @@ var CSSPropertyOperations = {
}
if (styleValue) {
style[styleName] = styleValue;
} else {
} else if (hasShorthandPropertyBug) {
var expansion = CSSProperty.shorthandPropertyExpansions[styleName];
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Maybe just do expansion = hasShorthandPropertyBug && ...; to avoid the duplication in style[styleName] = '';? Otherwise looks good to me.

if (expansion) {
// Shorthand property that IE8 won't like unsetting, so unset each
Expand All @@ -129,6 +136,8 @@ var CSSPropertyOperations = {
} else {
style[styleName] = '';
}
} else {
style[styleName] = '';
}
}
}
Expand Down