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An appeal from the browser to the website to not track the user's surfing habits. Firefox was the first browser to include a do-not-track option for the user, and the others followed. However, the reason this is an "appeal" is because it relies on the cooperation of tracking companies that are self-regulating and offer an opt-out function. However, most of the large ad networks in the U.S. are compliant.

The "do-not-track=yes" is a header in the HTTP request for a Web page that is sent to the website. See tracking cookie and Web bug.

Firefox Privacy Setting
Clicking this box sends a DNT header with all Web page requests. Firefox was the first Web browser to offer this, and the others followed.
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References in periodicals archive ?
Where do you start when the midfield players pass to opponents, the defenders don't track runners, and the full-backs constantly find themselves out of position?
When pressed a little further on the manner of the goals, Mills continued: "If you don't track runners into the box they have got a chance of scoring, and they have done that in the first two minutes.
But it's hard to compare the frequency of those against Uber and complaints against traditional taxi services, because regulators usually don't track complaints against cabbies.
Many don't track insider buying and selling, lock-ups, deals with related entities, executive salaries and dividends.
You saw it recently against Liverpool - they don't track back as well as they go forward," said Boyd.
The next thing that will happen is that you'll learn what it really costs you to live - something you can't possibly know if you don't track your spending.
If you don't track your credit, you could be in for a surprise when you start gift shopping.
They look unsound defensively, with a keeper who looks as if he could crack at any moment, forwards who don't track back, and midfielders who don't provide any service.
However, finding a large number of quantified examples of ROI and innovation from HPC has been really difficult, as most users don't track their ROI from HPC or technical computing.
Despite the high cost of international job transfers, 61 percent of companies don't track the percentage of assignees who resign within two years of concluding their assignment; and 75 percent of companies don't track assignees' careers post-assignment.

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