[General] Pronunciation [ts] in sencences like as That's right, It's not serious,...

[nextbill]

Dear Sirs,

I have a question about a pronunciation [ts] in some of sentences like as:
- It's not importance.
- It's not serious
- It's not worth it
or
- What's this?
- What's that?
- What's the matter?
- What's going on?
- What's happening?
....
You can refer their in web site: https://www.speaklanguages.com/english/phrases/more-common-expressions
I tried to listen to above these sentences many times but I can't found the pronunciation [t's at the end of (It's and What's )].
I don't sure the [ts] was pronounced here and how to pronounce it.
Could you explain more detail about that?
And could you recommend a document relating to it?

Thank you!

 

[GoesStation]

When I say what or that without a following s, I momentarily press the tip of my tongue against my hard palate (the ridge at the top of the mouth). When I say what's or that's, my tongue arches up to touch the hard palate; its tip may touch my upper teeth. The tongue against the palate briefly stops the flow of air before releasing it to flow between the teeth to make the /s/ sound.

The samples on the page you linked are very clearly pronounced in an English accent.

 

[Raymott]

The apostrophe makes no difference. The /t's/ is pronounced the same as any /ts/, as in 'cats'.

 

[nextbill]

Thank GoesStation and Raymott for your explanation.
Pronunciation /t/ in (what's) or (that's) maybe Stop /t/. Is that right?
I just thought that when I found the video: https://www.youtube.com/watch?v=cnSuZ3gkDDk

 

[Raymott]

It's not a stop /t/. It's a true /t/ (as per your video).