I would like to know all possible ways to run a JS (local) on a third page, where my real intention is to manipulate the frontend even to give me the custom view of a page x.
I can already do this using the program Fiddler where it is possible through the " AutoResponder " feature I would replace the existing JS or CSS on a page with my local files, but I would like to know it according to the experience of those who know ... what other ways to do this?
You can inject JavaScript into pages using a feature called userscripts . This is often used, including the GitHub organization with StackOverflow members in Portuguese has some scripts that we have developed to help us on a daily basis. You can see more details in this meta post .
You can use extensions like Tampermonkey (Chrome) and Greasemonkey (Firefox).
Chrome also natively supports the insertion of userscripts , there are details about this in this answer .
I would have to think of something like this: Let's say you would have a text box, to type something, such as username:
User Name : <input ... value="Nome">
Now, if you type like this: "onmouseover=" event
<input ... value=" "onmouseover="evento ">
Or something like this: We have a text box, type a browser, if we type such thing, it may appear "No results were found for [searched word]" And if we type: Code, and the browser or other site does not find anything, if it does not have any security, can execute the script. Let's say this is HTML:
<div>Não foi encntrado nenhum resultado para <script>alert("script")</script></div> Example 2:
<script type="text/javascript">
function Pesquise(){
/*Script do navegador ou parte de pesquisa de um site*/
document.getElementById("Result").innerHTML = "Não foi encontrado nenhum resultado para " + document.getElementById("CaixaPesquisa").value;
}
</script>
<input id="CaixaPesquisa" type="text" value="Código aqui"/><input type="submit" value="Pesquisar" onclick="Pesquise();"/>
<div id="Result">
</div>