What is the actual size of the memory used by javascript in the chrome task manager?

what is the difference between the actual size inside and outside the memory brackets used by js as shown in the figure? What does it mean? What does it mean if the value in parentheses is larger than the outside? Which sizes are worth meeting that indicate a memory leak?

Mar.12,2021

I haven't seen it for several days before, but I just came to ask a question today and found the answer. The
Memory column represents native memory. DOM nodes are stored in native memory. If this value is increasing, the DOM node is being created. The
JavaScript Memory column represents the JS heap. This column contains two values. The value you are interested in is the real-time number (the number in parentheses). Real-time numbers represent the amount of memory that reachable objects are using on your page. If this number is increasing, either new objects are being created or existing objects are growing.

but with regard to "reachable objects on the page" in JavaScript Memory brackets and "objects on the page" outside the parentheses?

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