AccessiWeb 2.2 - Rule 4.18.1


This test consists in checking whether each audio sequence played automatically and defined with an object, an embed, an applet or a bgdound tag can be stopped by the user or the volume can be shutdowned

Business description

Criterion : 4.18

Test : 4.18.1

Test description :

Does each audio sequence that is played automatically via an object, applet, embed tag, a javascript code or bgsound property pass one of the conditions below?

  • The audio sequence lasts less than or equal to 3 seconds
  • The audio sequence can be stopped by an action initiated by the user
  • The volume of the audio sequence can be controlled by the user independently from the system volume control.

Level : Bronze

Technical description

Scope : page

Decision level : semidecidable



Selection1 : All the embed, object, applet and bgsound tags (embed, object, bgsound, applet)


The selection handles the process.

For each occurence of the Selection1 raise a MessageA

MessageA : Check Manually the elements
  • code :ManualCheckOnElements
  • status: NMI
  • parameter : snippet
  • present in source : yes


Not Applicable

Selection is empty (The page has neither object, nor applet, nor bgsound, nor embed tag)


The selection is not empty


We detect the elements of the scope of the test to determine whether the test is applicable.

On latest webdev data set (2013-10-30, 78,000 pages), the test scope (embed, applet, bgsound, object) has been found on 6804 pages, i.e on 8.7% of the pages