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Dimensions: avoid fetching boxSizing when setting width/height #4010

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Merged
jbedard merged 1 commit into from
Mar 25, 2018
Merged

Dimensions: avoid fetching boxSizing when setting width/height #4010

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9 changes: 7 additions & 2 deletions src/css.js
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Original file line number Diff line number Diff line change
Expand Up @@ -378,7 +378,12 @@ jQuery.each( [ "height", "width" ], function( i, dimension ) {
set: function( elem, value, extra ) {
var matches,
styles = getStyles( elem ),
isBorderBox = jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
scrollBoxSize = support.scrollboxSize() === styles.position,

// To avoid forcing a reflow, only fetch boxSizing if we need it (gh-3991)
boxSizingNeeded = scrollBoxSize || extra,
isBorderBox = boxSizingNeeded &&
jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
subtract = extra && boxModelAdjustment(
elem,
dimension,
Expand All @@ -389,7 +394,7 @@ jQuery.each( [ "height", "width" ], function( i, dimension ) {

// Account for unreliable border-box dimensions by comparing offset* to computed and
// faking a content-box to get border and padding (gh-3699)
if ( isBorderBox && support.scrollboxSize() === styles.position ) {
if ( isBorderBox && scrollBoxSize ) {
subtract -= Math.ceil(
elem[ "offset" + dimension[ 0 ].toUpperCase() + dimension.slice( 1 ) ] -
parseFloat( styles[ dimension ] ) -
Expand Down