Sample · before and after

The same algebra lesson, two ways.

Most course materials save equations as pictures. A screen reader can't read a picture, so a blind student hears "graphic" where the math should be. Below is one short lesson both ways. Press play to hear what a student would hear.

Lesson written by Proof & Plain for this sample, November 9, 2026.

Before

Equations as pictures

Finding the vertex of a parabola

A quadratic function has the form

Its graph is a parabola. The vertex is the turning point. Its x-coordinate is

Example. Find the vertex of

Here a is 1 and b is −4, so

Then

Picture of a graph, left without a text alternative in the original

Picture of a table, left without a text alternative in the original

This panel deliberately repeats a common mistake, so the images here have no text alternatives.

What a screen reader says

Heading: Finding the vertex of a parabola.
A quadratic function has the form
graphic
Its graph is a parabola. The vertex is the turning point. Its x-coordinate is
graphic
Example. Find the vertex of
graphic
Here a is 1 and b is negative 4, so
graphic
Then
graphic
graphic
graphic

After

Fixed by Proof & Plain

Finding the vertex of a parabola

A quadratic function has the form $f (x) = a x^{2} + b x + c$ .

Its graph is a parabola. The vertex is the turning point. Its x-coordinate is $x = - \frac{b}{2 a}$ .

Example. Find the vertex of $f (x) = x^{2} - 4 x + 3$ .

Here a = 1 and b = −4, so $x = - \frac{- 4}{2 (1)} = 2$ .

Then $f (2) = 2^{2} - 4 (2) + 3 = - 1$ . The vertex is (2, −1).

Figure 1. The vertex is the lowest point of this parabola.

Values of f(x)
x	0	1	2	3	4
f(x)	3	0	−1	0	3

What a screen reader says

Heading level 2: Finding the vertex of a parabola.
A quadratic function has the form f of x equals a x squared plus b x plus c.
Its graph is a parabola. The vertex is the turning point. Its x-coordinate is x equals negative, b over 2 a.
Example. Find the vertex of f of x equals x squared minus 4 x plus 3.
Here a is 1 and b is negative 4, so x equals negative, negative 4 over 2 times 1, which equals 2.
Then f of 2 equals 2 squared minus 4 times 2 plus 3, which equals negative 1. The vertex is the point 2, negative 1.
Figure: graph of f of x equals x squared minus 4 x plus 3. An upward-opening parabola that crosses the x-axis at 1 and 3, crosses the y-axis at 3, and has its lowest point at 2, negative 1.
Table with 2 rows and 6 columns: values of f of x. x 0, f of x 3. x 1, f of x 0. x 2, f of x negative 1. x 3, f of x 0. x 4, f of x 3.

Depending on the screen reader, a picture with no text alternative is announced as "graphic", "image" or its file name. Spoken math wording varies by screen reader; the text above follows common speech rules. Play uses your browser's built-in voice.

The check report

Element	Before	After
Equations	5 pictures of equations	5 MathML equations a screen reader can speak and navigate
Graph	Picture with no description	Labeled graph with a full text description
Table of values	Picture of a table	Real table with header cells
Zoom and reflow	Equations blur when enlarged	Equations stay sharp at any size
Heading	Bold text only	Real heading

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