Watch and listen to the same PDF but in different states of accessibility. The first example shows you a badly scanned and tagged PDF. The second example shows you the exact same section of the PDF but made accessible.
Attribution: [Lauren Alcorn] (2016, Apr.5 ) Example of Using a Screen Reader with an Accessible PDF [Video File]. Retrieved from https://youtu.be/YE5gZPUXu_A
If you are curious the screen reader is reading an excerpt from Andrea Smith's (2016) Heteropatriarchy and the Three Pillars of White Supremacy - Rethinking Women of Color Organizing. In Violence, I. N. C. I. T. E. W. C. A. (pp. 66-73) Color of Violence: The INCITE! Anthology.
Durham: Duke University Press.
Here is an example of a screen reader reading an article, which is formatted in 2 columns but the reading order has not been set, so the screen reader jumps from column to column, reading the text incorrectly. If this pdf had been properly tagged and the reading order set, the screen reader would know the correct reading order.
[NC State IT Accessibility] (2013, Oct.16) Untagged PDF Being Read by a Screen Reader [Video File]. Retrieved from https://youtu.be/GaNwnsT4B5s