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Use a default font size when it can't be computed directly. (mathjax/MathJax#3458) #1380

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Use a default font size when it can't be computed directly. (mathjax/MathJax#3458) #1380

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12 changes: 11 additions & 1 deletion ts/adaptors/HTMLAdaptor.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,13 @@ export class HTMLAdaptor<
extends AbstractDOMAdaptor<N, T, D>
implements MinHTMLAdaptor<N, T, D>
{

/**
* The font size to use when it can't be measured (e.g., the element
* isn't in the DOM).
*/
public static DEFAULT_FONT_SIZE = 16;

/**
* The HTML adaptor can measure DOM node sizes
*/
Expand Down Expand Up @@ -588,7 +595,10 @@ export class HTMLAdaptor<
*/
public fontSize(node: N) {
const style = this.window.getComputedStyle(node);
return parseFloat(style.fontSize);
return parseFloat(
style.fontSize ||
String((this.constructor as typeof HTMLAdaptor).DEFAULT_FONT_SIZE)
);
}

/**
Expand Down