param ($url, $tofind, $agilitypackpath="f:\dan\tools\html-agility-pack\HtmlAgilityPack.dll", $xpath="//a")

add-type -Path $agilitypackpath
$client = New-Object System.Net.WebClient
$contents = $client.DownloadString($url)

$doc = New-Object HtmlAgilityPack.HtmlDocument 
$htmldoc = $doc.LoadHtml($contents)

$linknodes = $doc.DocumentNode.SelectNodes($xpath)
foreach ($node in $linknodes)
{
	$link = $node.GetAttributeValue("href", "")
	if ($link)
	{
		$c = $client.DownloadString($link)
		if ($c.Contains($tofind))
		{
			$isfound = "true";
		}
		else 
		{
			$isfound = "false";
		}
		New-Object PsObject -Property @{Url = $link; IsFound = $isfound;}
	}
}

Check destinations of a list of links in a document for a string

html

Windows PowerShell