User:DWalden (WMF)/sandbox

Without phantom
$$-e\sqrt{u},\; -e'\sqrt{u'},\; \ldots$$

phantom
$$-e\sqrt{\phantom{u'}u},\; -e'\sqrt{u'},\; \ldots$$

$$\frac u y \choose z$$ $$\phantom{\frac u y}? \choose z$$

$$\Gamma^{\phantom{u}u}_{u\phantom{u}u}$$

$$\int u^2\,du=\underline{\phantom{(2/3)u^3+C}}$$

$$\sum_{u\in\{0,\ldots\, 10\}\phantom{3^{3^{3^u}}}} \sum_{y\in\{0,\ldots\, 3^{3^{3^u}}\}} y\cdot u$$

$$\frac{u+y+z}{u \phantom{+}\phantom{y}+z}$$

vphantom
$$-e\sqrt{\vphantom{u'}u},\; -e'\sqrt{u'},\; \ldots$$

$$\frac u y \choose z$$ $$\vphantom{\frac u y}? \choose z$$

$$\Gamma^{\vphantom{u}u}_{u\vphantom{u}u}$$

$$\int u^2\,du=\underline{\vphantom{(2/3)u^3+C}}$$

$$\sum_{u\in\{0,\ldots\, 10\}\vphantom{3^{3^{3^u}}}} \sum_{y\in\{0,\ldots\, 3^{3^{3^u}}\}} y\cdot u$$

$$\frac{u+y+z}{u \vphantom{+}\vphantom{y}+z}$$

hphantom
$$-e\sqrt{\hphantom{u'}u},\; -e'\sqrt{u'},\; \ldots$$

$$\frac u y \choose z$$ $$\hphantom{\frac u y}? \choose z$$

$$\Gamma^{\hphantom{u}u}_{u\hphantom{u}u}$$

$$\int u^2\,du=\underline{\hphantom{(2/3)u^3+C}}$$

$$\sum_{u\in\{0,\ldots\, 10\}\hphantom{3^{3^{3^u}}}} \sum_{y\in\{0,\ldots\, 3^{3^{3^u}}\}} y\cdot u$$

$$\frac{u+y+z}{u \hphantom{+}\hphantom{y}+z}$$

Nested
$$-e\sqrt{\phantom{\ldots u'}u},\; -e'\sqrt{u'},\; \ldots$$

$$-e\sqrt{\phantom{\ldots h'}h},\; -e'\sqrt{h'},\; \ldots$$

$$-e\sqrt{\phantom{\frac u y \choose z v'}v},\; -e'\sqrt{v'},\; \ldots$$

$$-e\sqrt{\phantom{\begin{matrix} u & y \\ z & v \end{matrix} u'}u},\; -e'\sqrt{u'},\; \ldots$$