Normally, when you use an iFrame, Google "flattens" the iFrame with your content and treats it as part of the content itself. While this generally works, problems can occur if the iFrame fails to load, or if Google cannot access the iFrame.
In short, using iFrames is sometimes necessary and convenient, but you should avoid using them whenever possible.
FLASH is gone . If your content relies on Flash, your rankings may be gone too.
If your page still uses Flash, most browsers including Chrome will simply ignore it.
To audit Flash, Search Console's Mobile Usability report will cayman islands mobile database report if your site uses "incompatible plug-ins," including Flash.
Lazy loaded content is visible in the ViewPort
Lazy loading has become increasingly popular, especially since native browser support became available . Many CMS frameworks, including WordPress, now include lazy loading for images by default.
Support paginated loading with infinite scrolling
Like lazy loading, infinite scrolling is good for user experience, but not so good for search engines. If not set up correctly, it can hide information from Google.
The correct way to implement infinite scrolling is to use paginated loading , which means the URL changes as the visitor scrolls down the page. This allows users to share and bookmark specific pages of your content, and allows search engines to index sections of your content. Google recommends using the History API to be notified of your paginated loading, which tells the browser when to update the displayed URL as the user scrolls.