One thing to bear in mind is that even though these won't affect SEO they might affect CTR, e.g. if you have a within an <h1> or <h2> and Google decides to take this as your page title instead of the one you provide Google users will only see the text before the in the page title.

One thing to bear in mind is that even though these won't affect SEO they might affect CTR, e.g. if you have a <br \> within an <h1> or <h2> and Google decides to take this as your page title instead of the one you provide, Google users will only see the text before the <br \> in the SERPS page title.

One thing to bear in mind is that even though these won't affect SEO they might affect CTR, e.g. if you have a
  within an or and Google decides to take this as your page title instead of the one you provide Google users will only see the text before the
  in the page title

One thing to bear in mind is that even though these won't affect SEO they might affect CTR, e.g. if you have a within an <h1> or <h2> and Google decides to take this as your page title instead of the one you provide Google users will only see the text before the in the page title.