use templates as html tags.
this plugin handles files with .htm extension
<inclusiontemplate/>
<blocktemplate name="value">
some content
</blocktemplate>
<template name="inclusiontemplate">
hello world
</template>
<template name="blocktemplate">
<h> header </h>
<content/>
</template>becomes
{{>inclusiontemplate}}
{{#blocktemplate name='value'}}
some content
{{/blocktemplate}}
<template name="inclusiontemplate">
hello world
</template>
<template name="blocktemplate">
<h> header </h>
{{> Template.contentBlock}}
</template>