Accessibility - alt text



I have an understanding that any image or chart that supports the learning should have an alt text explaining the image or chart. For text box such as slide title, we do not need to give an alt text. If the name of this text box is 'slide title' on timeline and the text inside text box is 'Objectives', how will the screen reader read this? I have attached a screenshot of this example. 


Thank you,


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