October 2017
Intermediate to advanced
370 pages
8h 57m
English
Content preview from AMP: Building Accelerated Mobile Pages
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Variable substitution in AMP
AMP provides a mechanism whereby you can include special variables that will be replaced with actual values at runtime. There's a long list of such variables that can provide information about the client, such as SCREEN_WIDTH and SCREEN_HEIGHT, or about performance, such as PAGE_LOAD_TIME and SERVER_RESPONSE_TIME, among others. There are also miscellaneous variables such as RANDOM, which will be replaced with a random number, and QUERY_PARAM, which can be used to access query string parameters.
You can find out more about the available variables in the AMP specification (github.com/ampproject/amphtml/blob/master/spec/amp-var-substitutions.md).
One variable we are interested in here is CLIENT_ID. When the AMP runtime ...
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