performance.clearMarks()

The clearMarks() method removes the named mark from the browser's performance entry buffer. If the method is called with no arguments, all performance entries with an entry type of "mark" will be removed from the performance entry buffer.

Note:

This feature is available in Web Workers.

Syntax

performance.clearMarks();
performance.clearMarks(name);

Arguments

name Optional
A DOMString representing the name of the timestamp. If this argument is omitted, all performance entries with an entry type of "mark" will be removed.

Return value

void
 

Example

The following example shows both uses of the clearMarks() method.

// Create a small helper to show how many PerformanceMark entries there are.
function logMarkCount() {
  console.log(
    "Found this many entries: " + performance.getEntriesByType("mark").length
  );
}

// Create a bunch of marks.
performance.mark("squirrel");
performance.mark("squirrel");
performance.mark("monkey");
performance.mark("monkey");
performance.mark("dog");
performance.mark("dog");

logMarkCount() // "Found this many entries: 6"

// Delete just the "squirrel" PerformanceMark entries.
performance.clearMarks('squirrel');
logMarkCount() // "Found this many entries: 4"

// Delete all of the PerformanceMark entries.
performance.clearMarks();
logMarkCount() // "Found this many entries: 0"

Specifications

Specification Status Comment
User Timing Level 2
The definition of 'clearMarks()' in that specification.
Working Draft Clarifies clearMarks().
User Timing
The definition of 'clearMarks()' in that specification.
Recommendation Basic definition.

Browser compatibility

BCD tables only load in the browser