following elements should appear in blue on an orange background: $\sum \frac{x}{y}1\sqrt{2}$ $\frac{x}{y}$

following elements should appear with increasing size: $xxxx$

font variants: $\mathrm{A}\mathbf{A}\mathit{A}\mathit{A}$

test font style attributes: $\text{A}\text{A}\text{A}\text{A}$

following element should be inline: $x$, and this one centered on a new line: $$x$$