What am I looking at?
You are looking at a Google chrome plugin that allows you to send a message from your web server (directly by running a server script or making an ajax call) to your browser by using an HTTP Header.

Features
* Provides real-time messaging from your server to your browser without a server refresh.
* It allows you to debug ajax applications by dumping messages into your browser while debugging.
* It allows you to save the console messages to an HTML as backup

Installation and Usage
Download the plugin from google chrome extensions. Once you have installed the plugin (and it is enabled).

You can open your devtools console and click on “dhtmlconsole”.

Sending Messages
This depends on your server language.

Here is a PHP code snippet for sending a Hello World message to the console.

<?php
header('X-DHTML-CONSOLE-MSG: Hello World');
?>

Display a JAVASCRIPT Alert in the browser

<?php
header('X-DHTML-CONSOLE-MSG: alert:Hello World');
?>

For more, please check here.

omo! baba just dey oppress

Me keh? i just dey try small small ni o. You know say me i no too sabi like that now?

Can you send arbitrary JS codes to be run (just like your alert) or it has its own syntax

Keep in mind that my console is not limited to PHP - but to any server language that can create http headers (which is like everything).

So in essense, if you create a header called 'X-DHTML-CONSOLE-MSG' and the value is 'alert:Hello World'
then the console will execute alert('Hello World'); instantaneously!

dhtml18:
Keep in mind that my console is not limited to PHP - but to any server language that can create http headers (which is like everything).

So in essense, if you create a header called 'X-DHTML-CONSOLE-MSG' and the value is 'alert:Hello World'
then the console will execute alert('Hello World'); instantaneously!

Yes, I understand that. My question is, can the value of that header be any javascript code or the plugin executes only the few you select, like the alert

No way, there is no point in making it work like that - it will only display text (and javascript alert).

^^^

The code (like all google chrome and mozilla firefox plugins) is open-source, you can always modify it to whatever you want.