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+function getBlockAxisName(elem) {
+ var wm = getComputedStyle(elem).writingMode;
+ return (!wm || wm == 'horizontal-tb') ? 'height' : 'width';
+}
+
+function getBSize(elem) {
+ return elem.getBoundingClientRect()[getBlockAxisName(elem)] + 'px';
+}
+
+function setBSize(elem, bsize) {
+ elem.style[getBlockAxisName(elem)] = bsize;
+ elem.style.lineHeight = bsize;
+}
+
+// Ruby annotations are placed based on block-axis size of inline boxes
+// instead of line box. Block-axis size of an inline box is the max
+// height of the font, while that of line box is line height. Hence we
+// sometimes need to explicitly set the block-axis size of an inline
+// box to a block to simulate the exact behavior, which is what the
+// following two functions do.
+
+function makeBSizeMatchInlineBox(block, inline) {
+ setBSize(block, getBSize(inline));
+}
+
+function makeBSizeOfParentMatch(elems) {
+ // The size change is divided into two phases to avoid
+ // triggering reflow for every element.
+ for (var elem of elems)
+ elem.dataset.bsize = getBSize(elem);
+ for (var elem of elems)
+ setBSize(elem.parentNode, elem.dataset.bsize);
+}