Do DOM elements operate synchronously?

I am curious about whether DOM node attributes are synchronous when it comes to styling information. The article I was reading mentioned that scripts requesting style information like "offsetHeight" can trigger incremental layout synchronously.

The article suggested that there is a mechanism called the "dirty node" system that will pause script execution until the document has been fully laid out. So, if a dirty node n is modified and n.offsetHeight is called from JavaScript, it will wait until the offset height has been fully reified. Is my understanding of this correct? Can I always expect the browser to provide me with the most up-to-date version of any attached DOM element?

In other words, if I make changes to a node's styling and then retrieve a property that is affected by this styling, can I be certain that the value I receive will reflect the node with the updated styling? If not, how can I determine when my styling changes have taken effect?

htmlcssdomstyling

Answer №1

When data is retrieved from DOM elements, the current value will always be obtained, and properties that depend on other properties or elements will be accurately calculated when retrieved.

When modifications are made to the DOM resulting in layout changes, all elements are not immediately recalculated. This avoids unnecessary recalculations, especially if additional changes would necessitate another recalculation. The layout remains uncalculated until a recalculation is required. When a property dependent on that recalculation is retrieved, the recalculation is performed before the value is returned.

By carefully planning how properties are set and retrieved, unnecessary recalculations can be avoided.

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