# Combined Configurations¶

MathJax comes with a number of pre-defined and pre-compiled configuration files
in the `MathJax/config`

directory. The `default.js`

file contains nearly
all the possible configuration options together with comments explaining them,
so you can use that file to customize MathJax to your needs. Simply load
it via

```
<script type="text/javascript" src="path-to-MathJax/MathJax.js?config=default"></script>
```

where `path-to-MathJax`

is the URL to the MathJax directory on your
server or hard disk. If you are using MathJax from the CDN, you can
view the contents of default.js as a
reference, but you will not be able to edit the CDN copy. It is
possible to use the CDN copy of MathJax with your own configuration
file, however; see Using a Local Configuration File with the CDN for details.

The remaining files in the `MathJax/config`

directory are
combined configuration files that include not just configuration
parameters but also the files that MathJax would need to load for
those configurations; you can browse the directory on Github. This
means MathJax will have to load fewer files, and since each file access requires
establishing connections over the network, it can be faster to load one larger
file than several smaller ones. See Loading and Configuring MathJax for more details about how to load configurations, and how
to modify the parameters for a configuration file.

The following sections describe the contents of the combined configuration
files. Each comes in two flavors: a standard version and a “full” version.
The standard version simply defines the output processor(s) that are part
of the configuration, but doesn’t load the code that implements the output
processor. The full version loads the complete output processors, so
everything that MathJax needs for the page should be loaded up front, and
there will be no delay once the page is ready to be processed. To obtain
the “full” version, add `-full`

to the end of the configuration file
name.

## The `TeX-MML-AM_CHTML`

configuration file¶

This configuration file is one of the most general of the pre-defined configurations. It loads all the main MathJax components, including the TeX, MathML, and AsciiMath preprocessors and input processors, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, the CommonHTML output processor definitions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/TeX","input/MathML","input/AsciiMath","output/CommonHTML"],
extensions: ["tex2jax.js","mml2jax.js","asciimath2jax.js","MathMenu.js","MathZoom.js","AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax, the TeX, MathML, and AsciiMath input jax main code (not just the definition files), as well as the toMathML extension, which is used by the Show Source option in the MathJax contextual menu. The -full version also loads the CommonHTML output jax main code, plus the CommonHTML mtable extension, which is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor.
See the asciimath2jax configuration section for
other configuration options for the `asciimath2jax`

preprocessor, and the
AsciiMath input jax configuration section for
options that control the AsciiMath input processor.
See MathJax Output Formats for more
information on CommonHTML output processor.

## The `TeX-MML-AM_HTMLorMML`

configuration file¶

This configuration file is one of the most general of the pre-defined configurations. It loads all the main MathJax components, including the TeX, MathML, and AsciiMath preprocessors and input processors, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, both the native MathML and HTML-CSS output processor definitions, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
config: ["MMLorHTML.js"],
jax: ["input/TeX","input/MathML","input/AsciiMath","output/HTML-CSS","output/NativeMML", "output/PreviewHTML"],
extensions: ["tex2jax.js","mml2jax.js","asciimath2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax, the TeX, MathML, and AsciiMath input jax main code (not just the definition files), as well as the toMathML extension, which is used by the Show Source option in the MathJax contextual menu. The -full version also loads the HTML-CSS, PreviewHTML, and NativeMML output jax main code, plus the HTML-CSS mtable extension, which is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor.
See the asciimath2jax configuration section for
other configuration options for the `asciimath2jax`

preprocessor, and the
AsciiMath input jax configuration section for
options that control the AsciiMath input processor.
See MathJax Output Formats for more
information on the NativeMML and HTML-CSS output processors. See the
MMLorHTML configuration section for
details on the options that control the `MMLorHTML`

configuration.

## The `TeX-MML-AM_SVG`

configuration file¶

This configuration file is one of the most general of the pre-defined configurations. It loads all the main MathJax components, including the TeX, MathML, and AsciiMath preprocessors and input processors, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, the SVG output processor, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/TeX","input/MathML","input/AsciiMath","output/HTML-CSS","output/NativeMML", "output/PreviewHTML"],
extensions: ["tex2jax.js","mml2jax.js","asciimath2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax, the TeX, MathML, and AsciiMath input jax main code (not just the definition files), as well as the toMathML extension, which is used by the Show Source option in the MathJax contextual menu. The -full version also loads the SVG and PreviewHTML output jax main code, plus the SVG mtable extension, which is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor.
See the asciimath2jax configuration section for
other configuration options for the `asciimath2jax`

preprocessor, and the
AsciiMath input jax configuration section for
options that control the AsciiMath input processor.
See MathJax Output Formats for more
information on the SVG output processor.

## The `TeX-AMS-MML_HTMLorMML`

configuration file¶

This configuration file is a commonly used pre-defined configuration. It loads the most commonly used MathJax components, including the TeX and MathML preprocessors and input processors, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, both the native MathML and HTML-with-CSS output processor definitions, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
config: ["MMLorHTML.js"],
jax: ["input/TeX","input/MathML","output/HTML-CSS","output/NativeMML", "output/PreviewHTML"],
extensions: ["tex2jax.js","mml2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax, the TeX and MathML input
jax main code (not just the definition files), as well as the
toMathML extension, which is used by the Show Source option in the
MathJax contextual menu. The `-full`

version also loads the HTML-CSS,
PreviewHTML, and NativeMML output jax main code, plus the HTML-CSS
mtable extension, which is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor.
See MathJax Output Formats for more
information on the NativeMML and HTML-CSS output processors. See the
MMLorHTML configuration section for
details on the options that control the `MMLorHTML`

configuration.

## The `TeX-AMS_CHTML`

configuration file¶

This configuration file is for sites that only use TeX format for their mathematics, and that want the output to be as close to TeX output as possible. This configuration uses the CommonHTML output jax. The user can still use the MathJax contextual menu to select any other output jax if they desire.

This file includes all the important MathJax components for TeX input and output, including the tex2jax preprocessor and TeX input jax, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, the CommonHTML output, the AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/TeX","output/CommonHTML"],
extensions: ["tex2jax.js","MathMenu.js","MathZoom.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax and the TeX input jax main code
(not just the definition file), as well as the toMathML extension, which
is used by the Show Source option in the MathJax contextual menu. The `-full`

version also loads the CommonHTML output jax main code, plus the
CommonHTML mtable extension, which is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See MathJax Output Formats for more
information on the CommonHTML output processor.

## The `TeX-AMS_SVG`

configuration file¶

This configuration file is for sites that only use TeX format for their mathematics, and that want the output to be as close to TeX output as possible. This uses the SVG output jax. The user can still use the MathJax contextual menu to select another output jax if they desire.

This file includes all the important MathJax components for TeX input and output, including the tex2jax preprocessor and TeX input jax, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, the SVG output processor, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/TeX","output/SVG", "output/PreviewHTML"],
extensions: ["tex2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax and the TeX input jax main code
(not just the definition file), as well as the toMathML extension, which
is used by the Show Source option in the MathJax contextual menu. The `-full`

version also loads the SVG and PreviewHTML output jax main code, plus the
SVG mtable extension, which is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See MathJax Output Formats for more
information on the SVG output processor.

## The `TeX-AMS_HTML`

configuration file¶

This configuration file is for sites that only use TeX format for their mathematics, and that want the output to be as close to TeX output as possible. This uses the HTML-CSS output jax (even when the user’s browser understands MathML). The user can still use the MathJax contextual menu to select the NativeMML output jax if they desire.

This file includes all the important MathJax components for TeX input and output, including the tex2jax preprocessor and TeX input jax, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, the HTML-with-CSS output processor definition, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/TeX","output/HTML-CSS", "output/PreviewHTML"],
extensions: ["tex2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax and the TeX input jax main code
(not just the definition file), as well as the toMathML extension, which
is used by the Show Source option in the MathJax contextual menu. The `-full`

version also loads the HTML-CSS and PreviewHTML output jax main code, plus the
HTML-CSS mtable extension, which is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See MathJax Output Formats for more
information on the HTML-CSS output processor.

## The `MML_CHTML`

configuration file¶

This configuration file is for sites that only use MathML format for their mathematics. It will use the CommonHTML output. The user can still use the MathJax contextual menu to select any other output format if they desire.

This file includes all the important MathJax components for MathML input and output, including the mml2jax preprocessor and MathML input jax, the CommonHTML output processor definition files, the AssistiveMML extension, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/MathML", "output/CommonHTML"],
extensions: ["mml2jax.js","MathMenu.js","MathZoom.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"]
});
```

In addition, it loads the mml Element Jax and the MathML input jax main
code (not just the definition file), as well as the toMathML extension,
which is used by the Show Source option in the MathJax contextual menu.
The `-full`

version also loads the CommonHTML output
jax main code, plus the CommonHTML mtable extension, which is normally
loaded on demand.

See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor. See MathJax Output Formats for more information on the CommonHTML output processor.

## The `MML_SVG`

configuration file¶

This configuration file is for sites that only use MathML format for their mathematics. It will use the SVG output. The user can still use the MathJax contextual menu to select the other output formats if they desire.

This file includes all the important MathJax components for MathML input and output, including the mml2jax preprocessor and MathML input jax, the SVG output processor definition files, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/MathML","output/SVG", "output/PreviewHTML"],
extensions: ["mml2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"]
});
```

In addition, it loads the mml Element Jax and the MathML input jax main
code (not just the definition file), as well as the toMathML extension,
which is used by the Show Source option in the MathJax contextual menu.
The `-full`

version also loads the SVG and PreviewHTML output
jax main code files, plus the SVG mtable extension, which is normally
loaded on demand.

See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor.
See MathJax Output Formats for more
information on the SVG output processor.

## The `MML_HTMLorMML`

configuration file¶

This configuration file is for sites that only use MathML format for their mathematics. It will use MathML output in browsers where that is supported well, and HTML-CSS output otherwise. The user can still use the MathJax contextual menu to select the other output format if they desire.

This file includes all the important MathJax components for MathML input and output, including the mml2jax preprocessor and MathML input jax, the NativeMML and HTML-CSS output processor definition files, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
config: ["MMLorHTML.js"],
jax: ["input/MathML","output/HTML-CSS","output/NativeMML", "output/PreviewHTML"],
extensions: ["mml2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"]
});
```

In addition, it loads the mml Element Jax and the MathML input jax main
code (not just the definition file), as well as the toMathML extension,
which is used by the Show Source option in the MathJax contextual menu.
The `-full`

version also loads the HTML-CSS, PreviewHTML, and NativeMML output
jax main code files, plus the HTML-CSS mtable extension, which is normally
loaded on demand.

See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor.
See MathJax Output Formats for more
information on the NativeMML and HTML-CSS output processors. See the
MMLorHTML configuration section for
details on the options that control the `MMLorHTML`

configuration.

## The `AM_CHTML`

configuration file¶

This configuration file is for sites that only use AsciiMath format for their mathematics. It will use CommonHTML output. The user can still use the MathJax contextual menu to select the other output formats if they desire.

This file includes all the important MathJax components for AsciiMath input and output, including the asciimath2jax preprocessor and AsciiMath input jax, the CommonHTML output processor definition files, the AssistiveMML extension, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/AsciiMath","output/CommonHTML"],
extensions: ["asciimath2jax.js","MathMenu.js","MathZoom.js","AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"]
});
```

In addition, it loads the mml Element Jax and the TeX input jax main code
(not just the definition file), as well as the toMathML extension, which
is used by the Show Source option in the MathJax contextual menu. The `-full`

version also loads the CommonHTML output jax main code, plus the
CommonHTML mtable extension, which is normally loaded on demand.

See the asciimath2jax configuration
section for other configuration options for the `asciimath2jax`

preprocessor, and the AsciiMath input jax configuration section for options that control the AsciiMath
input processor. See MathJax Output Formats
for more information on the CommonHTML output processors.

## The `AM_SVG`

configuration file¶

This configuration file is for sites that only use AsciiMath format for their mathematics. It will use SVG output. The user can still use the MathJax contextual menu to select the other output formats if they desire.

This file includes all the important MathJax components for AsciiMath input and output, including the asciimath2jax preprocessor and AsciiMath input jax, the CommonHTML output processor definition files, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
config: ["MMLorHTML.js"],
jax: ["input/AsciiMath","output/SVG", "output/PreviewHTML",
extensions: ["asciimath2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js","AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"]
});
```

In addition, it loads the mml Element Jax and the TeX input jax main code
(not just the definition file), as well as the toMathML extension, which
is used by the Show Source option in the MathJax contextual menu. The `-full`

version also loads the SVG and PreviewHTML output jax main code, plus the
SVG mtable extension, which is normally loaded on demand.

See the asciimath2jax configuration
section for other configuration options for the `asciimath2jax`

preprocessor, and the AsciiMath input jax configuration section for options that control the AsciiMath
input processor. See MathJax Output Formats
for more information on the CommonHTML output processors.

## The `AM_HTMLorMML`

configuration file¶

This configuration file is for sites that only use AsciiMath format for their mathematics. It will use MathML output in browsers where that is supported well, and HTML-CSS output otherwise. The user can still use the MathJax contextual menu to select the other output format if they desire.

This file includes all the important MathJax components for AsciiMath input and output, including the asciimath2jax preprocessor and AsciiMath input jax, the NativeMML and HTML-CSS output processor definition files, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
config: ["MMLorHTML.js"],
jax: ["input/AsciiMath","output/HTML-CSS","output/NativeMML", "output/PreviewHTML"],
extensions: ["asciimath2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"]
});
```

In addition, it loads the mml Element Jax and the TeX input jax main code
(not just the definition file), as well as the toMathML extension, which
is used by the Show Source option in the MathJax contextual menu. The `-full`

version also loads the HTML-CSS and PreviewHTML output jax main code, plus the
HTML-CSS mtable extension, which is normally loaded on demand.

See the asciimath2jax configuration
section for other configuration options for the `asciimath2jax`

preprocessor, and the AsciiMath input jax configuration section for options that control the AsciiMath
input processor. See MathJax Output Formats
for more information on the HTML-CSS and NativeMML output processors.
See the MMLorHTML configuration section
for details on the options that control the `MMLorHTML`

configuration.

## The `TeX-AMS-MML_SVG`

configuration file¶

This configuration file is the same as TeX-AMS-MML_HTMLorMML except that it uses the SVG output renderer rather than the NativeMML or HTML-CSS ones. It loads all the main MathJax components, including the TeX and MathML preprocessors and input processors, the AMSmath, AMSsymbols, noErrors, and noUndefined TeX extensions, the SVG output processor definitions, the fast-preview and AssistiveMML extensions, and the MathMenu and MathZoom extensions. It is equivalent to the following configuration:

```
MathJax.Hub.Config({
jax: ["input/TeX","input/MathML","output/SVG", "output/PreviewHTML"],
extensions: ["tex2jax.js","mml2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
}
});
```

In addition, it loads the mml Element Jax, the TeX and MathML input
jax main code (not just the definition files), as well as the
toMathML extension, which is used by the Show Source option in the
MathJax contextual menu. The `-full`

version also loads the SVG and
PreviewHTML output jax main code, plus the SVG mtable extension, which
is normally loaded on demand.

See the tex2jax configuration section for
other configuration options for the `tex2jax`

preprocessor, and the
TeX input jax configuration section for options
that control the TeX input processor.
See the mml2jax configuration section for
other configuration options for the `mml2jax`

preprocessor, and the
MathML input jax configuration section for
options that control the MathML input processor.
See MathJax Output Formats for more
information on the SVG output processor.

## The `Accessible`

configuration file [Deprecated]¶

This configuration file is essentially the same as
`TeX-AMS-MML_HTMLorMML`

except that it includes options that are
designed for assistive technology, particularly for those with visual
challenges.

Warning

*This file is deprecated* since the controls that make
MathJax work with screen readers are now available in the MathJax
contextual menu and the AssistiveMML extension, and so there is no need to set them in the
configuration file any longer. So you can use any of the other
pre-defined configurations and readers with special needs should be
able to change the MathJax settings themselves to be appropriate for
their software.

The Accessible configuration is equivalent to the following:

```
MathJax.Hub.Config({
config: ["MMLorHTML.js"],
jax: ["input/TeX","input/MathML","output/HTML-CSS","output/NativeMML", "output/PreviewHTML"],
extensions: ["tex2jax.js","mml2jax.js","MathMenu.js","MathZoom.js", "fast-preview.js", "AssistiveMML.js", "[Contrib]/a11y/accessibility-menu.js"],
TeX: {
extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js"]
},
menuSettings: {
zoom: "Double-Click",
mpContext: true,
mpMouse: true
},
errorSettings: { message: ["[Math Error]"] }
});
```

This turns off the MathJax contextual menu for IE when MathPlayer is active, and passes mouse events on to MathPlayer to allow screen readers full access to MathPlayer. It also sets the zoom trigger to double-click, so that readers can see a larger version of the mathematics by double-clicking on any equation.

In addition, it loads the mml Element Jax, the TeX and MathML input jax
main code (not just the definition files), as well as the toMathML
extension, which is used by the Show Source option in the MathJax
contextual menu. The `-full`

version also loads the HTML-CSS, CommomHTML,
and NativeMML output jax main code, plus the HTML-CSS mtable extension, which
is normally loaded on demand.